Why may not be charged with an electric screwdriver battery
Over the past decades, the battery tool conquered from the usual network power tool even those niches where the dominance of traditional equipment seemed unshakable. Even shock drills are available with food from portable batteries, not to mention ordinary screwdrivers. Despite the overall high reliability of the battery tool, the nutrition elements are still the weakest, as well as, to a certain extent, chargers for them. Having discovered that the battery of a portable electric screwdriver is not charged, it is necessary to localize the malfunction and decide on the repair or replacement of the faulty unit.
The most common reasons for the failure of the batteries include:
- corrosion and oxidation of contacts due to storage in high humidity conditions;
- deep discharge due to prolonged non.use;
- development of the resource of the charge-discharge cycles;
- The lithium-ion batteries may fail the internal control scheme;
- a large loss of container due to the “memory effect” of the battery prone to such a phenomenon;
- drying of electrolyte during prolonged operation or storage;
- mechanical damage (including internal) due to blows on the battery body.
Chargers often lose their performance due to:
- corrosion and oxidation of contacts caused by the same causes;
- hidden cliff of the network cord (most often near the case or fork);
- failure of internal components;
- bent contacts due to mechanical exposure.
To make a decision on an attempt to restore the performance of the nutrition elements and the charge of replenishing the charge, it is important to determine the true cause of the malfunction.
How to check for serviceability charger
The very first diagnostic method is visual inspection. So it is possible to determine mechanical damage to the case, network cord, as well as oxidation and corrosion of contacts. If everything is in order, the charger must be included in the network 220 volts. Almost all blocks are equipped with indicators of the availability of supply voltage, which shine even without an installed battery.
If there is no reaction in the form of a glow of a light bulb after inclusion in the network, and there is obviously the voltage in the outlet, it is necessary to exclude the burning of the indicating LED. To do this, you will have to measure the constant voltage at the output of the charger.
If it is not, you need to check if 220 volts come for the entrance terminals of the charger. If the cord is removable, then it can be rolled with a multimeter for integrity. If not, you have to open the body housing and call from the fork to the connection points with the charger board.
This operation must be performed by turning off the network cord from a 220 volt socket.
If the network voltage on the board is present, that is, the grounds to assume the way out of the system of the charge of the charge of the charger.
The battery does not charge
Electric screwdriver after prolonged use, it happens, fails. Its working element may stop charging, which will lead to the impossibility of performing the functional abilities of the tool, the tool, roughly speaking, will “die”.
In order to extend the life of the tool, so that you do not have to remove it from the zone of visibility, you can try three methods alternately. Each subsequent is considered more complex and costly. They are in:
- restoration and increase in the container after its reversible loss (memory effect);
- adding distilled water to the electrolyte;
- replacing some or all battery blocks.
The service life of the battery for an electric screwdriver
The battery can serve about three to four years with its proper operation and storage. In practice, this period is sometimes reduced to two years. Changing the tool constantly is very expensive, so it is better to choose the best option for certain goals at once.
There are 3 different types of batteries:
- Nickel-cadmium. The most affordable in price, but short.lived, especially with frequent work in cold weather conditions.
- Nickel-metal-gidrid. A small device that does not differ in a long service life.
- Lithium-ionic. The most popular, for a long time can not be discharged, but have a higher cost than the above options.
Regardless of the type of battery, their service life depends on the number of charges used and storage methods. That is, the more the tool works, the faster it is discharged. At the same time, “simple” in the work negatively affects the term of use, especially if you keep the tool in the state when it sat down.
Detailed instructions for charging the battery of an electric screwdriver
Complete with each Makita screw.fingers are attached to the battery and charger for it. It is with the help of this memory that the drive is replenished. The whole process of recharging can be divided into several steps:
- Elimination of the battery. To remove the battery from the electrical equipment, it is necessary to press on the digging of the element fixation (located on the battery block) and move forward the drive by moving forward.
- Connecting ZU. Before charging the Makita electrical screwdriver battery, connect the charger to the power source. The light bulb blinking with green will be the guarantor that the device is ready to work.
- Battery installation. When you are convinced of the normal functioning of the memory, you can install the battery in it. To do this, insert the element all the way in accordance with the designations “” and “-“.
Evidence of the charging process will be an indicator, glowing continuously red. As soon as the light bulb becomes green (without blinking at the same time), you can remove the battery from the device. It should be removed if the indicator blows in red. This indicates an overheating of one of the elements (ZU or AKB) or the failure of the equipment.
The time of full charge replenishment depends on the type of drive. So, the lithium-ion household battery gains 100% of energy in about 1-1.5 hours. The nickel-cadmium element equipped with the same capacity will be charged for 6-7 hours. The approximate charge time for each specific accumulative component is indicated in the technical technical passport of the electrical appliance.
Practical advice on using the drive
For the correct functioning of an electric screwdriver and extending the life of its battery, you should remember the following rules:
- The first charging (before the first use of the equipment, be sure to charge its accumulative component to the mark of 100%);
- Storage (with prolonged non-use, store nickel-cadmium elements in almost discharged form, nickel-metallological-charged by 100%, lithium-ion-discharged by 50%);
- Replacing the element (with frequent overheating of the battery, it is recommended to replace it with a new one);
- Compatible equipment (use only a charger compatible with it for charging).
In addition, do not forget to monitor the charge indicator and remove the source when reaching a 100% energy level. These simple tips will not make the life of the device unlimited, but largely extend it.
Makita screwdrivers are compatible with all types of batteries (Nicd, NIMH, LI-ION). Choosing a drive should take into account the characteristics of the electrical.
The full use of power tools without the energy of the battery is impossible. over, in the first collision with the process of replenishing the electric drive.
Disk saw is a convenient power tool actively used in everyday life and construction.
The peorator is a multifunctional power tool that every builder or responsible owner should have.
Makita electrical jigsaw is a high.quality tool that cuts various materials.
A drill is the most common power tool that should always be at hand with a responsible owner or a qualified builder.
Corner grinder angular grinder is a universal power tool that should always be at hand.
How to correctly charge the electric screwdriver Makita
How true and how much to charge the battery of an electric screwdriver?
The screwdrivers has long been constant popular not only among the professional builders, at the same time ordinary people, because these units are unable to when it is necessary to screw something or, on the contrary, promote. The multifunctionality of the screwdrivers is the main prerequisite for the popularity of these units, both in everyday life and in large construction, all the users have many difficulties when it is concerned with the recharge of batteries, which are equipped with most of the screwdriver models.
What remains to make our client that it exists, that with incorrect charging, the so.called “memory effect” arises, in other words, with certain criteria, the charge capacity may decrease, and in the near future the unit will be discharged the least a lot. You, such an effect appear when a person tries to charge an electric screwdriver not fully discharged battery. The correct charging of the battleships of screwdrivers has a lot of subtleties, therefore it is fundamentally to see what remains to our client the nuances of this business, so that the electric screwdriver retains its functionality and performance for more than one year.
The main types of batteries of screwdrivers
Batteries for screwdrivers: lithium li-ion, nickel-cadmium ni-cd, nickel-metallhydridic ni-mh.
Manufacturers of domestic screwdrivers use various batteries in the process of production of their own units that have their own characteristics of work and, accordingly, charging. For the possibility of an electric screwdriver, he worked without failures along a long time, it is important to painlessly read the annotation that is attached to it. It should be noted that various screwdrivers differ in many parameters, in property with price, quality and power, because it remains to make our client the screwdrivers are divided into semi.professional and profiles. Accordingly, the batteries installed by the manufacturer are also different in price, quality and, most importantly, the capacity of the charge.
In professional models, which are more expensive, you are installed by batteries with a greater capacity, therefore, of course, they work without charging a significantly larger period of time. Most of the professional builders have a spare, in advance charged battery for continuous operation, however, if the passage if an electric screwdriver is designed to perform ordinary housework, the 2nd battery is completely not necessary, although in a number of all kinds of all kinds of accumulator of an electric screwdriver is located in set with the unit. There are 3 main types of batteries, which are usually used in screwdrivers:
The most extensively used at the current time are nickel-cadmium batteries for screwdrivers. myth of the view is quite small in sizes, comparable to a small price and large charge capacity. The main shortage of these batteries is the “memory effect”, however, with proper use and recharging, the batteries of this type happen more than 1000 times, although it should be noted that even with proper use, the charge capacity will decrease evenly until the minimum reaches the minimum. In addition, it is worth noting that such a battery contains highly toxic substances, because their creation significantly harms the environment, which has become a prerequisite for their ban in some countries.
Nickel-metallhydrid batteries are worthwhile to use in 2nd place. Batteries of this type belong to the brand new generation, because they are one hundred percent non.hazardous for the external environment. Myth type has a mass of advantages, the main thing where the lack of “memory effect” is. But it is worth seeing that they own the highest current current, and these batteries should be stored only in a charged form, while the design of unused electrical screwdriver is intended for a month is certainly required to discharge the device and charge the ground.
Electric screwdriver. How to increase the service life of the battery.
How to increase the service life of the battery. How to correctly discharge and charge the battery. What will happen with.
5 Rules for charging nickel-cadmium batteries
This video is what, how to operate nickel cadmium batteries Nicd. You will be interested to know how to correctly discharge.
Lithium-ion batteries are a relatively new product in the sale of these funds. They do not have a “memory effect”, do not require compliance with the recharge cycles to restore the charge capacity. The working recharge of these batteries requires a completely small amount of time, while the capacity of these funds is quite high. But these batteries and shortcomings are found, in private, reducing the performance of fresh air and a fairly high price.
Features of charging batteries of screwdrivers
A very fundamental moment is the 1st charging of an electric screwdriver, because it depends on it specifically whether the full charge capacity will be activated. Who is the type of battery has its own characteristics of primary recharging. The greatest difficulty is charging nickel-cadmium options. The 1st recharge is suitable three times so that the entire charge capacity is filled. Such a macar, after buying, the unit must be loaded absolutely, then turn on and quit to work until its working version of the discharge, then you need to recharge again and discharge again, three times.
The nickel-metallhydride option is worth a hundred percent to be discharged the first time, because you, in the purchase, have a small charge, later you need to quit it quite well. Re.charge the batteries of this type, of course, only when they are absolutely discharged. The cycle of working charging should be taken into account 1 4-5 times, after that there is an option to additionally charge the batteries, even if they are not fully discharged.
The lithium-ion batteries are more modern, therefore there are no special requirements for their recharging, because under any circumstances their capacity does not decrease.
At the first and next recharging, it is necessary to take into account that the most rational effect of recharging is achieved solely if this common hearing process takes place at a temperature of 10 to 30 ° C. over, it should be noted that when charging, certain types of batteries are variations to start warming up, which can very badly affect the entire battery. Do not allow overheating of the entire battery above 50 ° C. After the work, it is most ideal to store the battery separately from an electric screwdriver, although this is not necessarily.
Features of charging screwdrivers with different stresses
Batteries for screwdrivers differ in Voltage. 12, 14.4 and 18 volts. Charging devices that come with the tool correspond to the battery face value. It is not allowed to charge the equipment with the help of a disabled voltage, t.to. This can lead to a battery breakdown. When buying a new item, you need to choose a device with the same characteristics as that of a broken device or acquire a universal one, with the ability to set the necessary value.
Is it worth it to charge before long.term storage?
If the device is not used for a long time, you should correctly approach its storage in order to prevent damage to the batteries.
Nickel-cadmium batteries are discharged before storage, but not completely, but partially, before a decrease in power. Before operation, they are completely discharged and charged at least three times.
Nickel-metallological batteries are stored completely charged, and before starting to work as a tool, they are kept on charging for at least a day. After the device passes 200-300 ditches of the group, its capacity may partially decrease.
Lithium-ion batteries are prohibited to completely discharge-this leads to disconnecting the protective scheme. Store batteries filled up to 50 percent. The number of discharge and charging cycles is not limited, but their duration is no more than two years.
How to charge the Li-Ion battery of a screwdriver
Brought a couple of weeks ago 6 Makitovs devices for repair.
4 screwdriver, 1 jigsaw and 1 grinder.
Voiced me a repair price. It turned out that only one screwdriver had an economic meaning to restore. The rest went to spare parts.
How I Fixed My Faulty Makita Battery
In general, it was time to replace a manual battery tool for itself.
So I bought new screwdrivers with Li-Ion batteries for all the carpets at once.
The guys are accustomed to ni-CD batteries, and Li-Ion requires a completely different approach. Directly to the opposite.
And, of course, it is not only about how to charge the Li-Ion battery of the screwdriver. If it is wrong to discharge and/or store it, it will also be little good for him.
Therefore, I looked at a couple of dozen sites and a couple of hours video.
Threw all the husk and made the most “dry” squeezing without “water”.
How to charge the Li-Ion screw of screwdriver and other important rules for its operation
- Li-Ion works optimally in the range from.10 to 45 ° C. Charge at a temperature of 10 to 30 ° C.
- 1 time every 4 months, carry out a full cycle of discharge-rack for calibrating the charge sensor in the battery controllers. That is, discharge to almost 100% and put for charging for 12 hours.
- Store Li-Ion on the charge of 40-60%. It is impossible to store charged by 100% Li-andi, since in this case it will forever lose 20% of the container in 3 months. With proper storage-with a charge of 40-60%-Li-Ion will irrevocably lose only 1% of the capacity in the same 3 months.
- If the screwdriver is equipped with two Li-Ion, then charge one up to 40-60% and store it as a backup. Use it as a worker once a month-charge it to 100%, discharge to 40-60% and leave again for storage. The second Li-Ion is the main worker. We have worked. at the end of each day, put it for recharging, even if it is discharged by less than 10%.
Reserve Li-Ion use if the main Li-Ion worker is discharged as a result of intensive work and there is no time to wait for it to charge.
That’s all. Now you know how to charge Li-Ion battery for an electric screwdriver.
I handed this to every joiner, and I also hung ads in the workshop on the board.
And there may still be a question-why did I switch from Ni-CD to Li-Ion batteries?
Here are the advantages of LI-Ion batteries over NI-CD:
- at least 2 times a large specific container;
- self.discharge is several times less;
- lack of memory effect, which makes it possible to recall at any time;
- It withstands an average of twice as many “charge-discharge” cycles, that is, it will live twice as long.
- Li-Ion is subject to aging. Well, and ni-cd eternal or something? They also get old.
- Li-In has low stability when working at low temperatures. All this is in the past. Now Li-Ion is doing such that they work and.10 ° C Stopudovo. And in some sources it is indicated that with.30 ° C can work;
- Li-Ion require the use of only the original charger. Well, what is there? All screwdrivers are sold just with their original item in the kit.
- Li-ion has a high cost. Yes, I wouldn’t say anymore. Recently went to the store. Ni-CD batteries below 1 t.R. did not see. And on AliExpress you can buy a whole electric screwdriver with Li-Ion for 3 tons.R.
Well, finally, if you work with an electric screwdriver professionally-do not hesitate especially-it will crumble at the same time with the Li-Ion battery. So buy a separate batter separately you do not have to.
Just with a reasonable non-edged use for a couple of years, an electric screwdriver should be enough.
And, yes, one more important rule. Do not save on the power of an electric screwdriver. It corresponds to the voltage of the battery. Take a 20-volt minimum. Will twist like a beast.
And buy weak. there will be little sense from it, and there will be no joy from penny savings either.
I generally scored screwdrivers with Li-Ion batteries at 25 volts. The joiners are not loud. Especially after Ni-CD for 14 volts.
Look like that’s it. There were questions, do not agree with something-write to Комментарии и мнения владельцев.
P.S. Want to receive notifications about new articles of this blog? Click on this button:
P.S.S. After reading the article, questions, Комментарии и мнения владельцев, objections appeared? Write them in the Комментарии и мнения владельцев below. I will try to answer everything.
How to charge a screwdriver: rules and features
To correctly charge the screwdriver of the screwdriver, you just need to follow the instructions of the User Management. But sometimes there are situations when you have to retreat from the “original charger” or obvious solutions. For these cases, we have compiled a list of general recommendations. Absolutely most problems with the battery power tool are resolved with them.
Preference to a native charger
For everyday regular use there is nothing better than a native complete charger. The manufacturer of the native charge usually takes care of all the nuances of the charge and safety, including proper temperature control. Suppliers of analogues (especially cheap ones with AliExpress and other Chinese trading floors) are often saved on schemes to achieve the lowest price.
If an analogue of the charger, then good and compatible
When there is no native charger, select a compatible AC adapter with a suitable charging mode (NICD/NIMH or Li-Ion CC/CV) in accordance with the characteristics on the battery label. Do not save on the charger, since safety depends on it (especially if you plan to use it for a long time).
The indication of the charge should be
You can understand that the screwdriver of the screwdriver is charged, only by indication of the charge (on a power tool or charger).
You need to understand the principle of indication
In lithium-ion batteries, the indicator operates in voltage (can be measured on contacts), although there may be exceptions in expensive models (Kulonovsky method). You can interrupt charging at any time and resume from any percentage.
In nickel-cadmium, the indication is more difficult-the full charge is determined by temperature (in cheap devices in its value at 50 ° C, in expensive ones-by dynamics at 1 ° C per minute) and the voltage signature (it drops by 5 mv when the battery is completely charged).
Chargers can be incompatible
Do not use a different type charger, as this can lead to damage to the batteries or even to a fire.
Alternative charge only as “Templar”
In extreme cases, for one.time recharge, if there is no native or other charger, it is allowed to use a universal or automobile charger.
Charging methodology differs in type of battery
What current is needed for charging the screwdriver battery based on the type of chemistry (nicd, nimh or li-ion/li-pol) and charging mode in accordance with the characteristics of the battery (for example, Nicd battery with a capacity of 1200 mAh is charged with an current of 250 mA approximately 6 mA approximately 6.7 o’clock).
Chargers Li-Ion, NIMH, NICD are incompatible
- It is impossible to charge lithium-ion batteries from nickel batteries;
- and vice versa (LI-Ion Adapter NICD/NIMH batteries) is also unacceptable;
- Do not charge the NICD accumulators with the NIMH battery, otherwise you will reload them;
- It is possible to charge the NICD battery by the NIMH.
The temperature is strongly affected by the battery
Charge at room temperature. Explicit overheating of the battery (palms hotly) during charging indicates a malfunction in elements or charger. Some NICD charging devices have a capture of 60 ° C. this is a critical level. Wear occurs when heated above 45 ° C.
Overheating is not allowed
Usually the temperature sensor protects from overheating. For him, you need a third contact on the battery of the screwdriver. If the battery is very hot when charging (up to 50 ° C and above, applies to all types), then remove it with charging to allow to cool.
Follow the batteries
Unnecessarily (for example, if you do not need calibration/recovery), do not hold a loaded screwdriver of a screwdriver on charging. Do not keep them on charging longer than 16 hours in principle! Inspect the contacts for oxides and pollution (clean them, degrease).
Some screwdrivers have a built.in battery and power controller, others use interchangeable batteries that must be inserted into the tool. Some are connected to the power adapter with a cable, others involve charging by installing the battery for the charger.
Given these design differences, you need to figure out what type of chemistry of nutrition elements is used on your tool.
Li-Ion (lithium-ionic), Li-Pol (lithium-polymer) battery of a screwdriver
Feature: there is no memory effect, but they do not like deep discharge (especially the storage of discharged).
how to charge cordless drill without charger
DIY: poorly suitable for independent assembly, as they require spot welding, BMS, balancing and testing, otherwise dangerous. You can use our production.
Service life: 3 years, 300-500 cycles.
- one. Charge anyway from any charge level.
- 2. Discharge up to 0% harmful to capacity.
- 3. Do not store discharged (better ~ 50%).
- four. When using a new screwdriver with Li-Ion, first charge, only then use.
- 5. You can interrupt Li-Ion/Li-Pol charging at any time and charge at any time.
The technology does not like low voltage (below 2.5 V to the element), since the chemical reactions harmful to maximum capacity are accelerated. Long storage of a discharged screwdriver with a Li-Ion or Li-Polymer battery will lead to its failure or even self-ignition.
Ni-mh (nimh, nickel-metallogidride) screwdriver of a screwdriver
Feature: charge and discharge the screwdriver of the screwdriver with NIMH-chemistry once every three months, a high self-discharge.
DIY: well suited for independent assembly, relatively safe.
Service life: 5 years, 700-1000 cycles.
- one. Charge in the mode how it is more convenient for you to use the tool.
- 2. Requires a training cycle charge-discharge every three months.
- 3. Try not to store discharged (better than 50%).
- four. Before using a new screwdriver on NIMH, make a cycle or two.
- 5. It is not recommended to interrupt charging NIMH, but it is allowed with periodic charge training.
Frequent questions and answers how to charge a battery for an electric screwdriver
We have collected questions that you sent us most often by screwdrivers and other battery power tools.
Q: “How much to charge screwdriver?””
Complete and compatible standard chargers usually from three hours. Duration depends on the capacity.
For example, powerful nuts with heavy batteries are charged for 7 hours. Impulse chargers are used in professional electrical screwdrivers, on which one battery is charged in an hour and a half.
Q: “Is it possible to store a screwdriver battery?””
Not recommended. Before storage, charge no more than 50% for Li-Ion/Li-Pol, at least 50% for NIMH and no more than 20% for NICD. Support this charge during the storage period, checking the level of 1-3 months.
- NIMH is sometimes returned to life refueling after 3-5 years of storage (contrary to common messages on the Internet about this type of batteries, source of Battyuniversity);
- Nicd as a result of self.discharge can be completely sitting and stored for a long time up to 5 years with refueling if the voltage drops below 1V per element;
- Li-Ion cannot be stored discharged under any circumstances (even in the refrigerator)-copper shunts dangerous with short circuit are formed when the voltage decreases to 2V per element (they also have a self-discharge, just less than others).
Q: “How to store lithium-ion batteries of a screwdriver?””
- one. Charge up to 40%;
- 2. Put in a place with a temperature not higher than 20 ° C and not lower than 0 ° C;
- 3. Store with relative humidity no higher than 50% (and so that it does not hesitate) and without temperature changes (sunlight or heating radiator).
You can’t freeze them (the molecular structure changes). And in the refrigerator, fluctuations in relative humidity from 40% to 90% create the conditions for oxidation of the surface materials of the electrodes.
Q: “What to do if I forgot to charge the screwdriver and kept it discharged?””
Most often, a situation arises when you poorly loaded the batteries of the screwdriver, left them for 1-3 months or even longer in the box. And now they were discharged so that they are completely dead. the tool does not even turn on.
Most likely, you will need to buy a new battery.
Even if it is possible to “push” the old cells, their capacity is already irrevocably reduced to 70% and below. Such a capacity is considered a critical wear and recommendation for replacement (for example, in image brands like Apple, this threshold is increased to 80%).
Q: “The screwdriver of the screwdriver does not charge. is it possible to fix it?””
- Measure the voltage at the battery terminals (for Li-Ion it should be higher than 3V/element, for NIMH/NICD above 1B/element);
- If the voltage is low, then try to charge the battery for several hours even if it does not show signs of life (this will help to “push” it from low voltage);
- If the voltage is higher, then check the terminals and connectors for the presence of dielectric (dirt, garbage, oils). clean them, degrease them;
- Sometimes the terminals “fail” into the battery body or even break. bend back or plunder;
- Change the charger (perhaps a charger is faulty);
- Sometimes the protection fee counts cycles (often in original Li-and-ion batteries from expensive brands), after which it stops charging and requires replacing or flashing the controller;
- one of the elements can fail. replace it and lick the charge.
Q: “How to push the battery from a screwdriver?””
Many do not like the word “push”. But how else to explain the ability to remove the battery from a condition of a reduced capacity or low voltage.
- one. Put for long.term charging even if there is no indication;
- 2. If there is an indication, but the battery is charged too quickly, then charge up to 100%, leave it on the charge (under supervision) for several hours (preferably at least 8 hours, including for LI-Ion with the purpose of saturation with a minimum current with borderline voltage );
- 3. Dissolve the battery with the idle stroke of the screwdriver before disconnecting and perform the charge to 100%;
- four. Hold it on the charging for several hours.
Q: “Is it possible to charge a screwdriver with a car battery?””
In theory, you can. It is source of direct current. But you can not directly connect if the native charger of the screwdriver is 12V.
The charging current must limit the resistor with a face value for a power of at least 10 W. We do not recommend without experience to select resistance, as advised on the Internet.
Even with the sink of the resistor, there is a high risk of burning the screwdriver battery or its protective circuit. It must also be remembered that the car’s battery gives different voltage depending on the degree of charge.
Is it possible to restore the battery from the screwdriver, if it is old, does not work or worn out?
Write questions in the Комментарии и мнения владельцев. We are waiting for your messages and @neovoltru.
Subscribe to our group to learn news from the world of autonomy of gadgets, about their improvement and progress in scientific research of batteries. We are also conducting a rich blog in Zen and Medium. go see.
How to load the battery correctly
The correct approach to loading of batteries can significantly extend the service life of the battery. Each type of batteries has its own requirements.
The first time after the purchase
The batteries coming with an electric screwdriver are sold in a partially charged state. Perhaps they were fully charged, but to what value the energy supply decreased during storage due to the effect of self.discharge is unknown. The lithium-ion battery can be loaded immediately so that the battery is in full readiness for work. The nickel-cadmium battery must first be discharged before the fall of the speed of the shaft of the electric screwdriver, and then charge it completely. This will help to avoid loss of capacity. It is desirable to do with NIMH batteries in the same way, although its memory effect is not so clearly pronounced.
At what stage of discharge to connect charging
In most cases, an electric screwdriver will tell you when it is necessary to resume the energy of the batteries. With a discharged battery, the turn of the shaft falls and the torque decreases, it becomes impossible to work and it will be necessary to replace the battery with a charged. The matter in such a situation will not reach a deep discharge.
The battery discharged during operation must be charged in the near future, because with prolonged storage (even without turning on the electric motor), the discharge of the battery elements through its own internal resistance will occur. This can lead to deep discharge of the battery and to its failure.
Many screwdrivers have a battery level indicator. You can focus on it. But such systems are quite rude and non.linear, so they can be used to very approximately assessing the state of residual energy. If the battery is lithium-ionic, then it can be charged at any time from any level.
How much time to charge
Battery loading time can be different. It depends:
The actual battery capacity is never unknown (it can be measured by the control category, but it is really pointless). During operation, it changes from the maximum declared by the manufacturer (at the new battery) to practical zero (at the end of the work period). The level of the residual charge as a percentage is also impossible to determine (it can only indirectly evaluate by actual stress). For these reasons, it will not work to control the charge by time. You can only say that a deeply discharged new battery at the same current charges longer than a slightly discharged old. Other criteria are used to end the loading and disconnecting:
There are other ways to determine the end of the charging process.
For NIMH elements when loaded with a large current at the end of the process, the effect of reducing the voltage on the element is observed. This phenomenon can be used as a signal for turning off the charger. You can also control the process to reduce the rate of voltage at the end of the load, but this method requires accurate measurement of the voltage and the use of microcontrollers for mathematical computing.
The charger characteristic of the nickel-metallogid battery (on the voltage graph, the area with a slowdown in voltage growth is visible and with a decrease in voltage at the end of the loading)
We recommend watching thematic video for viewing.
Storage rules for the battery of an electric screwdriver
Regardless of the type of power sources used, it is necessary to store an electric screwdriver in a dry and cool place (at a positive temperature). High humidity is harmful in that it causes corrosion of metal cases of elements, which ultimately causes the flow of electrolyte and damage to other elements and contacts of the battery. Also, increased water in the air adversely acts on the contacts of the power tool and on the winding of the electric motor.
If we talk only about batteries, then nickel-cadmium battery can be stored completely discharged. Lithium-ion and nickel-metallogids should be charged at least partially. About once a month, it is advisable to charge the batteries so that the batteries do not go into the deep category due to self.discharge. This applies more to NIMH batteries having a high current of self-discharge, and in a smaller one-to lithium-ion. Ni CD battery, if it has a residual charge, it is simply impossible to recharge-you need to make a category cycle in order to avoid loss of capacity. It is necessary to install the battery on an electric screwdriver, at idle (or load, if possible) to be discharged to the loss of revolutions, and complete loading. If the nickel-cadmium battery has been stored for a long time, then several full cycles of the charge may need to be restored to restore the container.
Correct handling of batteries of electric screwdriver can significantly extend its service life. But do not unconditionally trust the tips posted on the Internet. there are quite doubtful recommendations. It is better to independently understand the features of each design and relate to advice consciously.
Methods of charging
One of the most convenient ways is if there is a universal (laboratory) power source, which can be adjusted to the voltage and measure the current. It is even better if there is a current restriction mode. In this case, the desired charging current is set, and the source itself increases the output voltage after increasing this parameter to the battery. But you will have to monitor the end of the process on your own.
It is also necessary to independently determine the end of the first stage of loading of lithium-ion batteries (to control the balancing of the elements, the battery housing must be disassembled, so you will have to hope that the BMS board is working) and reduce the current in time.
At the end of the process, the battery must be disconnected in time (controlled upon reaching the greatest voltage). The end of the charging is selected from the table. It is necessary to multiply the maximum voltage of a single can by the number of elements. If it is unknown, it is necessary to divide the voltage indicated on the battery building (it is usually overstated), to the voltage of one can and round the lesser side.
If there is no such mode, you will have to follow the current manually. As the energy and voltage growth is replenished, it is necessary to adjust the voltage on your own, holding the selected level by the control ammeter. If the source does not have a built.in meter, it will be necessary to use an external device (for example, a multimeter in the corresponding mode). As a general approach. you can use any adjustable power source, but the control of the parameters on the battery must be mandatory.
On the network there are tips to use a charger for a car. If such a it allows you to adjust the voltages manually, then it can be used to charge the battery of screwdrivers. If the device is automatic, then this is not the best idea. Such items are designed to work with 12-volt batteries, and household screwdrivers can be designed for 20-volt food (professional-even higher). Therefore, it will not work to fully replenish the supply of energy in these cases. In addition, lead-acid elements are used in cars, and they require a constant voltage charge, which for the cases under consideration is unacceptable.
The video uses inverter charging for cars.
The most important measure of security is not to leave the charged battery unattended. Automation system that controls the parameters of the process, in this case, there is no. Therefore, you will have to manage the procedure manually. This is especially true for lithium-ion batteries. With all their advantages, they are prone to spontaneous combustion in emergency modes, and their chemical composition makes it extremely difficult to extinguish.
If possible, it is also necessary to control the temperature of the charged battery. When it increases, the process should be immediately interrupted. You can measure the temperature with a conventional thermometer. You can also use a contactless meter (pyrometer), a USB termometer with a remote sensor and other methods.
Another simple way of charging is described in the video.
In the absence of a standard source of charging an electric screwdriver without a native charger is possible. But you will have to control the process on your own. Responsibility for the final result is completely on the owner of an electric screwdriver.