How gel batteries differ from AGM?
On which cars it is undesirable to use AGM?
There is no such limitation. Even if we consider ancient cars with an absolutely faulty relay-regulator and an unstable voltage in the network, then in this case the AGM car battery will not die earlier than usual, but even later. The voltage limit above which you can get into trouble is approximately 14.5 V for conventional batteries and 14.8 V for AGM.
Car battery 2014
AGM (Absorbent Glass Mat) is a technology for manufacturing batteries with absorbed electrolyte, which is impregnated with the micropores of the separator. The developers use the free volume of these micropores for closed recombination of gases, thereby preventing water from evaporating. Hydrogen and oxygen leaving the negative and positive plates, respectively, enter the bound medium and re-combine, remaining inside the battery. The internal resistance of such a battery is lower than that of its “liquid” predecessors, since the conductivity of the fiberglass separator is better than the traditional “envelopes” made of polyethylene. Therefore, it is capable of delivering higher currents. A tightly compressed plate package prevents the active mass from crumbling, which makes it possible to withstand deep cyclic discharges. A car battery like this can run upside down. And if you break it to smithereens, then even in this case, there will be no poisonous puddle: the bound electrolyte must remain in the separators.
Today’s areas of application of AGM are cars with the “Start-Stop” mode, cars with increased energy consumption (Ministry of Emergencies, “ambulance”), etc. But tomorrow a “simple” car battery will slowly go down in history.
Are AGM and conventional batteries interchangeable with each other?
The AGM car battery replaces the “regular” one by 100%. Whether such a replacement is needed if the car has enough serviceable standard battery is another question. But the reverse replacement, of course, is incomplete. it can be used in practice only in a hopeless situation and as a temporary option.
Is it true that when a car battery with a larger capacity is installed on a car than a standard one, it will undercharge, and the starter may fail??
No, it’s not true. What will prevent the battery from fully charging? It is appropriate to draw an analogy: if you scooped up a glass of water from a bucket or from a huge barrel, then to restore the original level of liquid, you will need to top up the same glass from the tap. both into the bucket and into the barrel. As for the expected breakdown of the starter, its current consumption will not change, even if the battery capacity grows a hundred or a thousand times. Ohm’s law does not depend on ampere hours.
Conversations about upcoming breakdowns are only appropriate for extreme lovers who are used to getting out of the swamp on the starter. At the same time, the latter, of course, heats up very much, and therefore a small battery that discharges faster than a large one can save it from fatal overheating, dying first. But this is a hypothetical case.
Let us immediately note one curious nuance. In Soviet times, it was strictly forbidden to install a car battery with a larger capacity on a number of army trucks! But the reason was precisely that when the engine did not want to start, drivers often turned the starters until the battery was completely discharged. At the same time, starters overheated and often failed. And the higher the battery capacity, the longer it was possible to mock a poor electric motor. It was to protect starters from such bullying that the requirement once appeared not to exceed the battery capacity above the “standard” one. But now it is irrelevant.
Why do you need a peephole indicator?
This indicator allows you to roughly estimate the density and level of the electrolyte in order to find out if the car battery needs recharging. By and large, this is a toy, since the peephole is in only one jar out of six. However, many serious manufacturers at one time were forced to introduce it into the design, since the lack of a peephole was perceived by consumers as a disadvantage.
What is hidden behind the term “calcium battery”?
Nothing special: this is a regular advertising stunt. Yes, the icons “Ca” (or even “Ca. Ca”) on car batteries are more and more present today, but this does not make them any easier. But calcium is a much less heavy metal than lead. The thing is that we are talking about very small (fractions or one percent) additions of calcium to the alloy from which the battery plates are made. If it is added to both the positive and negative electrodes, then the same “Ca. Ca” is obtained. All other things being equal, such car batteries are more difficult to boil, which is important for maintenance-free batteries. Such batteries have less self-discharge during storage. Therefore, “ordinary” batteries with additives of the formerly traditional antimony (they are usually given by the presence of plugs) are almost never on sale today! Note that not everything in them is so bad: for example, they tolerate deep discharges much better.!
Everything about battery-powered screwdrivers: pros and cons
The main difference between the cordless screwdriver and the network model is the absence of a cord. Autonomy of work and non-attachment to an outlet are the main advantages of a tool with a battery inside.
The advantages of the device also include:
- Mobility. The tool and the charging battery are in the same housing, no additional elements are needed for operation. It is enough to take the device in hand, and it is already ready to work. Can be moved anywhere.
- Compactness. As a rule, household autonomous screwdrivers are small in size. This makes the device especially convenient in hard-to-reach places.
- Versatility. Technique replaces screwdriver and drill.
In practice, the cordless instrument is indispensable in objects without electricity, when it is necessary to frequently move or climb to a height. The device can be operated outdoors or indoors.
The only drawback here is the need to periodically charge the battery. Manufacturers are trying in every possible way to solve this problem, for example, offering 2 batteries with the tool. While one is in the working process, the second restores energy.
In branded models, the manufacturer, in addition to standard features, also offers the user auxiliary functions. They greatly facilitate the work and can become a point above the “i”, dispelling doubts whether it is worth buying this or that model.
Most often found in tools:
- charge indicator. a small light that will tell you when to put the battery on recharge;
- reverse motion. and unscrew the screw, and the drill can be removed from the thick board;
- impact mechanism. indispensable if you need to work with a stone surface or brick;
- illumination of the workplace. in some screwdrivers it is so powerful that there is no need for additional lighting.
There is also an impulse, various blockers, speed switches, etc. Each additional function is a plus to the price of the device, which means that you need to be 100% sure about its need for the device.
To choose the perfect device for specific purposes, you should pay attention to the number of revolutions. The manufacturer calls this parameter speed or rotational speed. It is adjusted by pressing the “trigger”. the harder you press, the greater the speed. In addition, the frequency shows whether the tool will be able to screw the screw into a dense material and what is the approximate diameter of the hole if the screwdriver replaces the drill.
If the customer is confident that the device will only be used for tightening screws and bolts, 500 rpm is more than enough. Screwdrivers acting as drills operate at 1200 rpm.
A nuance: there are models with 1, 2 and 3 speeds on the market, where one is for self-tapping screws, the second is for drilling small holes, the third is for working with metal or other durable raw materials.
Criteria for choosing a cordless screwdriver
To choose a quality screwdriver, it is not enough to pay attention only to the price, appearance and comfort in the hand. It is necessary to additionally evaluate a lot of characteristics. Those who do not trust the consultants can independently study the technical passport of the device they like. It describes the main parameters and capabilities. What is important when buying a cordless screwdriver and which device is better for the house from inexpensive ones is described in detail in the following sections.
The numbers in the characteristic show with what force the screwdriver twists the self-tapping screw or how much force is required to overcome the load during drilling. What is the practical use of knowing the parameter? The diameter and length of the bolt to be screwed in depends on the torque. The higher the indicator, the longer and thicker the screws can be used in work without fear of failures or breakdowns. For example, at 40 N / m, it will be possible to freely “drive” a self-tapping screw 10 cm long into the tree.
In small household models, the torque is from 10 to 30 N / m, but the indicator can be adjusted by adjusting to the nozzle. For adjustment, a limiter is provided on the screwdriver body. a ring that goes immediately after the chuck. The user can coordinate the effort for a specific screw by scrolling the limiter. Result: as soon as the self-tapping screw is tightened to the desired level, the chuck will stop, although the motor will work at the same time.
Interesting: the stop not only helps to tighten the bolts, preventing excessive “sinking” into the material, but also protects the tool from wear.
Voltage and other parameters
For an ordinary buyer of a screwdriver, it is enough to know:
- for household appliances, the voltage ranges from 10-14 V;
- for professional, the indicator should be more. from 18 V. Some instruments boast a level of 36 V.
The next characteristic is power. The parameter informs the user about the speed of the device. It is logical that the higher the power, the faster the self-tapping screw will be tightened. But you should not overdo it, for household purposes and do-it-yourself in-line repairs, a 500-700 W model is quite enough.
In order not to send the device for charging every half hour of operation, you should pay close attention to the battery. Modern screwdrivers use:
- Lithium-ion batteries are not subject to self-discharge, the most common. They can be charged up to 3000 times, and at any stage and discharge level.
- Nickel-cadmium. are not afraid of cold, they work efficiently at subzero temperatures. However, there is a small drawback. self-discharge. You need to store such a battery with 0% charge in order to save capacity to the maximum.
- Nickel-Metal Hybrid batteries are eco-friendly batteries found in some European brands. These batteries are compact and lightweight, but they are frost-resistant.
Comparing the characteristics of the battery, it is also worth looking at the capacity. The autonomy of the device and the number of possible recharges depend on it. Over time, the capacity decreases, this also needs to be taken into account.
How to choose a cordless screwdriver: 6 tips and a rating of 5 cool models
A screwdriver is essentially an electrical substitute for a screwdriver. It performs the same functions as the younger “brother”, only makes the process of tightening / unscrewing screws and bolts much faster. Such a tool is especially effective if there are tens or even hundreds of screws. The device can not only twist the screws. By installing a special drill, you can make holes in wood, plastic and thin metal with a screwdriver. powerful devices even take bricks and concrete. In general, the tool is indispensable in everyday life and during repairs.
- We choose according to technical characteristics
1.1. Main parameters: torque and rotation speed
1.2. Battery type, capacity and voltage
1.3. What else to pay attention to
- Popular manufacturers and their solutions
- Examples of models for different tasks
The questions of how to choose a cordless drill-driver and what the market offers today are by no means idle. Take, for example, two models from the same manufacturer. There is practically no difference in price: one costs 6 thousand, the other 6.5 thousand rubles. The battery voltage is the same. 14.4 V, the difference in battery capacity is 0.3 A / h, and the difference in torque is 2 Nm. What, then, is the difference between the models and which one should you ultimately choose? Look at the battery. Nickel-cadmium, as you know, makes it possible to work at low temperatures, but it is highly discharged and has a memory effect. Lithium-ion without memory effect and without self-discharge cannot work in the cold. If you know for what work you are buying a tool and where you will screw fasteners or drill, you know the answer to the question. We will devote this article to what characteristics to pay attention to and which brands to give preference to.
How to choose a cordless screwdriver?
We choose according to technical characteristics
The operating parameters of the screwdriver determine the scope of its use. Tools are divided into household and professional. The latter are equipped with powerful batteries to work for a long time without recharging. They cost, of course, a lot too. Households are designed for occasional use with modest performance. Your choice depends on your needs, and our task is to tell you about what modern manufacturers offer. Let’s start with the main.
1.1. Main parameters: torque and rotation speed
The torque value starts from 5 Nm and exceeds 200 Nm. Household models are characterized by 8. 20 Nm. Professional values start from 100. 130 Nm. This is a fundamental selection parameter, since it shows the moment of force that makes the spindle shaft rotate, and determines the choice of the material to be drilled, as well as the diameter and length of the fastener. For example, a household tool with a value of 18 Nm can screw 6×70 mm self-tapping screws into dry wood, and a professional tool with a torque of 165 Nm can work with 22×125 mm fasteners. Tool torque is adjustable. With the help of a limiter. a ring on the body, the required force is set, and as a result, the connection is reliably carried out, the integrity of the fasteners and material is preserved.
But the rotational speed shows the number of revolutions of the spindle with a fixed nozzle per unit of time. If they work with fasteners, this parameter is set at 500 rpm, for example, if you install hinges on a kitchen cabinet or fix a drywall sheet on a profile. If holes are drilled, it exceeds 1000 rpm. The rotation speed in most models is also adjustable. To drill more accurately, without jumping off the drill, you can select one of several speed modes. there can be 2, 3, 4. Adjustment of the rotation speed optimizes the effort when working with equipment of different sizes and materials of different density and structure.
1.2. Battery type, capacity and voltage
How to choose a cordless drill by battery type?
Nickel cadmium (NiCd) batteries are characterized by a large number of charge cycles and stable operation in different temperature conditions. However, to provide the required capacity, they are produced in rather large sizes, which is not always convenient for a mobile tool. They have a pronounced memory effect, and it is recommended to store them only in a completely discharged state, and to charge them only after a complete discharge. But they are still a viable option for a cordless instrument and make it cheaper. Nickel metal hydride (NiMH) batteries are lightweight and environmentally friendly. They are able to work for a long time without recharging, and this should be taken into account when choosing a tool. However, batteries do not like frost, and even at a temperature of 2. 5 degrees above zero, they can self-discharge, so it is problematic to store them in the trunk of a car or garage. Have no memory effect and must be kept charged. Lithium-ion (Li-Ion) batteries can be recharged at any time without waiting for a complete discharge. They are practically not susceptible to self-discharge, but they are sensitive to cold. They are distinguished by high performance with minimal weight. their energy consumption is almost 4 times higher than that of other types of batteries. Read about the features of choosing a tool for this parameter in the article “What battery is needed for a screwdriver?”.
What does battery capacity mean?
The duration of the tool’s operation without recharging depends on this characteristic. If you are thinking about how to choose a cordless screwdriver for your home, then you probably do not need an expensive professional one with a lithium-ion battery. If you are going to drill a couple of holes at home, you always have the opportunity to recharge the battery. The capacity of household tools, as a rule, is 1.5. 2 A / h, and professional. from 2 A / h and more. In this matter, such a moment as the speed of battery charging is also important. It can be from 3 to 12 hours. This, as a rule, is a household and quite budgetary instrument. For professional models, the charging speed indicator can be equal to 1 hour or even 0.5 hour. But they will cost much more.
What does the battery voltage affect??
It is generally accepted that the higher this characteristic, the greater the torque, i.e. power of the tool. But here it is important to consider the following nuance. Models are presented in the range from 3 to 36 V. If we take two models with different voltages, for example, 14.4 and 18 V, we will see that they have the same torque indicator. 70 Nm. The difference between them lies in the number of cells that make up the battery. The 18-volt model has more of them, which means more battery capacity. This ultimately leads to the fact that the tool is more expensive. It is up to you to decide how fundamental this characteristic will be in the choice of your instrument.
1.3. What else to pay attention to?
- The punch function is only required if you plan to drill into hard materials such as concrete or brick, or forcefully unscrew fasteners with knocked down threads or a jammed head. That is, if you try a drill as a hammer drill. Otherwise, you will simply overpay for this unclaimed function.
- The reverse, or reverse, function is designed to unscrew fasteners and pull out a drill stuck in a hole. It is important to check that the power remains the same when changing direction of travel.
- The quick-release chuck makes it possible to quickly change accessories without using a special key. It is enough to slightly press on it, and it will lock itself with a characteristic click. The manufacturer equips his tool with it in order to save the user’s time.
- Backlighting is a minor but often very useful feature. Agree, while working in a poorly lit place, it will make a difference.
- The dimensions and ergonomics of the instrument are just as important as the technical characteristics. Most of the models are integral with the battery. the pistol grip and the power supply are functionally and ergonomically arranged. Before purchasing, hold the tool in your hands and try on its dimensions and weight for your hand. You should be comfortable, and this quality does not depend on what you are going to do. drill a hole once a year or assemble cabinet furniture every day.
- Packaging can play a decisive role in how to choose a cordless drill / screwdriver. It is good when the tool comes with a second battery, a charger with fast and slow charging, a set of bits and drills. Convenient bag or case for storage and carrying.
Popular manufacturers and their solutions
Makita has been in business since 1915 and is today a leader in the development of construction tools. The manufacturer’s success is ensured by two simple rules. constant adaptation to the conditions of a developing market and the highest level of product quality. Take the Makita 6281DWPE cordless drill, for example. Ideal for domestic use. one of the most compact models in the range. With a battery capacity of 1.3 A / h and a voltage of 14.4 V, the model develops a torque of 36 Nm. At the same time, the number of torque settings reaches 16. is this not a proof of the manufacturer’s desire to create products that meet user requirements.
Ryobi has developed Ryobi ONE technology for the cordless line. Its essence lies in the fact that one battery fits a whole set of tools. If you have a cordless tool of this brand, you no longer need to puzzle over how to choose a cordless screwdriver. Choose any tool in this line. The Ryobi R18PDBL-LL99S cordless drill, for example, has a punch function. The brushless model comes with two 1.5 and 4 Ah batteries for long lasting performance. A two-speed gearbox will allow you to select the desired speed for working with different materials. A quick-release chuck and a convenient niche for fixing bits are provided for quick change of bits.
Bosch screwdrivers are divided into professional (blue) and household (green). The former are distinguished by a large set of functions and serious performance characteristics. And among the household ones, you can find the most compact models. The Bosch IXO V basic is one of the smallest cordless tools in the range. It weighs only 300 g and is dimensioned to carry the tool right in your. In this case, the battery capacity is 1.5 A / h, the voltage is 3.6 V, and the torque is 4.5 Nm. There is a battery indicator, built-in backlight, reverse and automatic spindle lock. In short, a high quality household tool.
Cordless drills-screwdrivers Zubr are an excellent solution when you need to buy a good tool, but you don’t want to overpay for a brand. Among the equipment of this domestic brand, you can choose a shock and multi-speed option, while keeping within the budget from 2,000 to 7,000 rubles. The ZUBR ZDA-10.8-Li-K cordless drill-screwdriver is one of the most popular models for household work and a small workshop. Two speeds, reverse, keyless chuck make this tool a reliable assistant for the practical owner. The model provides engine brake and start key lock functions and 12 options for torque limiting, the maximum value of which reaches 32 Nm. And what is no less valuable. a complete set, which includes a charging station, a set of bits and drills, a case for storing and transporting the tool.
Examples of models for different tasks
As you can see, choosing a cordless tool is no less important task than choosing an electric drill. The cordless tool is truly versatile. Its compactness and mobility are convenient for dismantling and assembling structures in confined spaces. To make it easier for you to choose, we have collected popular models in accordance with the rating on our site and the tasks with which the tool does the best.
Popular cordless drills
Short body for working in hard-to-reach areas.
Gentle battery charging and optimal use of energy thanks to Ultra-M technology
Removable battery with XR Li-Ion technology for easy removal and installation.
Metal clip for hanging on a belt
Metal gears in the design keep the tool intact throughout its service life.
System to protect the battery against overheating, overload and full discharge.
One-handed quick change of attachments
It is not necessary to use this method all the time due to the mismatch of the parameters. A car charger is suitable if it is equipped with voltage and voltage regulation elements. You just need to set the indicators correctly: the current is set as 0.5-0.1 of the total capacity of the battery.
Screwdriver battery device
The main components of power tool batteries:
- the case on which the contacts are located;
- thermistor, which is needed to protect against overheating (not all models have);
The main types of batteries and their features:
- Nickel-cadmium. they are cheaper than others, they are lightweight. The downside is the memory effect. They need to be discharged to zero and charged to the end. If this is not done, the capacity will decrease.
- Nickel metal hydride. This type has a less pronounced memory effect, therefore, such devices are more expensive. If the Ni-MH battery is idle for more than 30 days, a full recharge is required.
- Lithium-ion. One of the most popular types. They do not work well in the cold: they discharge faster, and with regular use and storage at subzero temperatures, their service life is reduced. But otherwise, such batteries are better than others. The high cost of Li-Ion is fully justified by the speed of charging and impressive capacity, as well as the absence of the aforementioned memory effect.
How to properly charge a screwdriver battery: 3 best ways to charge
This article explains how best to handle the cordless screwdriver in terms of charging and storage. The manual also tells you how you can recharge your power tool without the supplied charger.
An option that will fit almost any battery. Usually this is a model with crocodile clips. Often the user has the ability to set the required values. The method will not harm the battery, since the charging process will proceed in the same way as with the complete charger.
Battery Storage Tips
In order for the battery to serve for a long time, it is necessary to store it correctly:
- Do not leave the battery in the instrument.
- The place must be dry. Dampness negatively affects battery components.
- Avoid sudden changes in temperature.
These were general requirements, details are in the table.
Checking the battery status with a multimeter
A device like STHT0-77364 can help you troubleshoot various electrical components, including screwdriver batteries. It is best paired with other testers to achieve validity. This allows you to check the indicators and calculate the error.
Note: Before you start measuring, you need to make sure that the multimeter itself is working. To do this, you just need to connect it to an outlet along with another similar device and check the readings.
A device that allows you to diagnose the malfunction of elements on your own.
The main types of such devices:
- Control lamp (dial tone). equipped with two wires and makes it possible to determine the breaks in the wiring of the electrical appliance.
- Pointer. a device with a digital scale and an arrow. Such models are not very convenient to use. So that the numbers are clearly visible, the measurement scale should be half a page in size. In addition, such testers are often distinguished by confusing graduations and can only be operated in a horizontal position.
Tip: If you need an inexpensive multimeter, 94W101 will do.
Need a New Car Battery? How to Choose the Right Type
- Digital. with LCD display. The scale only shows absolute values. The switch, as in the previous case, is manual. The tester is not suitable for AC.
- Automatic. as the name suggests, this type of testers does not require manual adjustments of the regulator position. It is enough to indicate the required value using a special button.
General rules for charging the battery
If you do everything right, the battery will last a long time. Here are the basic principles for properly charging a screwdriver:
If the battery is being charged for the first time, it must be fully discharged and then fully charged before use.
The temperature in the room should be between 10 and 40 °.
To prevent the unit from overheating, it is necessary to disconnect the storage battery (accumulator) from the charger as soon as it is charged.
If the screwdriver is not used for a long time, it is necessary to recharge it once a month for preventive purposes.
What does the battery voltage say?
For cordless models, the power and rotation speed of the screwdriver depends on the battery voltage, which must correspond to the parameters of the tool:
- For screwdrivers, the maximum indicator is 36 V. These are the most powerful devices for working with metal and hard wood.
- 12-18 V. average value, suitable for most processes in repair and installation.
- 3-10 V. refer to low-power, and are used only for assembling soft materials or small diameter fasteners.
Installing a higher capacity battery on a weaker model will damage the latter faster. A 12 V battery on an 18 V device will, on the contrary, limit the power of the tool, so the voltage indicator of the drive must exactly match the value on the screwdriver.
Keep in mind that if you take two batteries with the same capacity, the longer operation of the tool will be provided by the one with the higher voltage.
What characteristics are important when choosing a battery for a screwdriver
Considering the advantages and disadvantages of different types of batteries, you can choose the one suitable for specific operating conditions. Now let’s look at two key characteristics that all types of batteries have that affect the choice of a screwdriver.
Lithium Ion (Li-Ion)
One of the new generations of batteries, which first appeared in 1991. Japanese radio engineering companies began to actively use them, and subsequently they managed to increase their power and use them with power tools.
This type is used in mobile phones, laptops and electric vehicles. Their cathode and anode are made of aluminum and copper foil, between which a perforated separator is installed. A valve may be present to release internal pressure.
Battery selection based on application
So, having thoroughly examined all the key factors, we will discuss with which battery to choose a screwdriver for home and professional activities. This will help you not to overpay and have a reliable tool at hand.
Estimated service life
The time that the battery will last on a screwdriver depends on the frequency of use and correct use. To some extent, the number of charge cycles is indicative of how long the battery will “live”. Based on this, you might think that lithium-ion batteries have the shortest lifespan.
In fact, these batteries do not have a number of disadvantages inherent in other types, due to which, in most cases, these batteries serve a longer period.
|Number of charge and discharge cycles||1000||300-500||600|
|The ability to charge quickly||4-8 hours||4-8 hours||30 minutes. 2 hours|
|The cost||cheap||cheap||cost up to 50% of the tool itself|
|Response to tool operation at full power||good performance||good performance||low rates|
|The effect of storing the charge level||there is||there is||not|
|Self-discharge||10% per month||7-10% per month||3-5% per month|
|Working in the cold||can work||can work||poorly tolerate low temperatures|
|Full discharge ratio||tolerate well||tolerate well||must be charged in advance|
Working in the cold
Although screwdrivers are more used for indoor repairs and furniture production, sometimes materials have to be fastened outdoors or in unheated buildings where there is a sub-zero temperature. Li-Ion batteries do not tolerate low temperatures.
In cold weather, such a battery can simply fail or discharge three times faster than usual. Nickel powered power supplies are the leaders in this category. They perfectly hold the charge and ensure the functionality of the screwdriver even at 20 degrees of frost.
What batteries can be used for screwdrivers
Power tool manufacturers always indicate in the characteristics of screwdrivers which batteries are recommended for working with them. The battery type is spelled out in several English letters. To know which battery to choose a screwdriver with, you need to understand the decoding of the abbreviation and know the advantages and disadvantages of each type of battery.
Which batteries are best for a screwdriver. an overview and comparison of all types
To find out which batteries are best for a screwdriver, consider their types and characteristics, and also compare with each other. This will help you choose the right battery type that can deliver the power you need and keep your tool powered for a long time.