Screwdriver voltage what affects the battery

Makita DF333DWAE 30 Nm

Main characteristics:

  • Chuck type. quick-clamping;
  • Maximum torque, (Nm). thirty;
  • Battery capacity, (Ah). 2;
  • Battery type. Li-Ion;
  • The number of batteries included. 2.

Body and ergonomics. All elements of the outer shell of this screwdriver are made of durable plastic, which allowed the developers to keep within the weight of 1.1 kg. Rubber pads on the handle and the protruding parts of the body not only contribute to a secure grip, but also soften the impact in the event of a fall. There is a spring clip for the possibility of wearing it on the waist belt. Built-in LED lamp illuminates the work area well at night.

Engine, gearbox, battery. The screwdriver is equipped with a reliable electric motor with a good air cooling system. Powerful enough to work with screws up to 5 mm in diameter. The model has two speeds of rotation with a maximum frequency of 450 and 1700 rpm for operations with fasteners and drills. Keyless chuck holds tooling with cylindrical shanks with a diameter of 0.8-10 mm.

Includes a pair of 1.5 Ah universal lithium-ion batteries with charge level indicator that can be used with other instruments of the same brand. It takes less than an hour to charge each of them in a standard device.

Complete set Makita DF333DWAE 30 Nm.

Functional. The maximum torque is 30 Nm. It can be lowered by rotating the drum. There is a reverse option and electronic speed control.

Pros of Makita DF333DWAE 30 Nm

  • High performance.
  • Large torque.
  • Convenient form.
  • Universal batteries.
  • Large case made of durable plastic with compartments for tools and consumables.
  • Acceptable cost.

Cons Makita DF333DWAE 30 Nm

  • When working on the reverse, the chuck is loosened.
  • The lamp is located close to the body, so it does not illuminate the entire working area.

Metabo PowerMaxx BS 12

Main characteristics:

  • Chuck type. quick-clamping;
  • Maximum torque, (Nm). 40;
  • Battery capacity, (Ah). 2;
  • Battery type. Li-Ion;
  • The number of batteries included. 2.

Body and ergonomics. This compact model is shortened in length and weighs only 1 kg. It has a raised grip, good balance and a wide launch key. It can be placed vertically without fear of dust getting into the interior. A well-positioned light bulb at the base of the handle provides good illumination of the work area. Provided with a metal hook for carrying on a belt.

Engine, gearbox, battery. The robust brush motor does not overheat even when drilling holes in metal up to 10 mm in diameter. The two-speed gearbox provides a spindle speed of up to 360 or 1400 rpm. Keyless chuck is designed for tooling sizes 1-10 mm.

The torque is adjustable and reaches a maximum of 40 Nm. Two 2 Ah lithium-ion batteries have no memory effect and are not prone to self-discharge.

Metabo PowerMaxx BS 12 complete set.

Functional. The model is equipped with a reverse, dynamic brake, spindle lock.

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Pros of Metabo PowerMaxx BS 12

  • Compact dimensions.
  • Convenient design.
  • Large torque.
  • Reliable materials.
  • Two powerful batteries with charge level indication.
  • Case and charging station included.

Cons of Metabo PowerMaxx BS 12

  • The manufacturer saved on the quality of the plastic for the suitcase.

Bosch GSR 120-Li

Main characteristics:

screwdriver, voltage, affects, battery
  • Chuck type. quick-clamping;
  • Maximum torque, (Nm). thirty;
  • Battery capacity, (Ah). 2;
  • Battery type. Li-Ion;
  • The number of batteries included. 2.

Body and ergonomics. The drill-driver of this brand, due to its small dimensions and the use of structural plastic, weighs only 950 g. It has a comfortable handle with a raised surface for better contact. The battery, inserted into the handle, does not interfere with work in cramped conditions. The LED light illuminates the drilling area well, even at night. There is a slot for attaching a strap, which makes it easier to move with the tool at height.

Engine, gearbox, battery. The power of the brush motor is sufficient to screw in 7 mm self-tapping screws. The keyless chuck is suitable for bit thicknesses from 1 to 10 mm. The gearbox operates in two modes with a maximum speed of 380 and 1300 rpm. A pair of compact 1.5 Ah lithium-ion batteries when used alternately to minimize downtime.

Functional. The model is designed for drilling holes and working with fasteners. The torque reaches 30 Nm and is infinitely adjustable by means of a rotary drum. The direction of rotation can be changed by simply moving the corresponding switch. The tool is sold with a plastic case, charger and two batteries.

Bosch GSR 120-Li complete set.

Pros of Bosch GSR 120-Li

  • Compact size and light weight.
  • Good ergonomics.
  • Quick tool change.
  • Illumination of the working area.
  • Adequate price.

Cons Bosch GSR 120-Li

  • Cannot be placed vertically on the base of the handle.
  • The cartridge loses its grip reliability over time.

It is worth saying a few more words about the number of work speeds. Not to be confused with the number of rotation speeds. These are two modes of operation that are used when working with different sizes of screws or drills. When working with small screws / drills, you can select a higher speed, when screwing in large screws or drilling large holes, a lower speed.

Additional functions

As usual, these functions are optional, but they greatly improve the usability. Some even raise the price, it is not at all significant, and some are quite noticeable. To choose the most inexpensive screwdriver, you can get by with a minimum. reverse and the presence of illumination of the place of work. The rest, of course, are useful, but more suitable for professionals.

Some additional features are very useful


Summing up the article, it is worth noting that the power of the screwdriver battery, although it is an important parameter when choosing a suitable model, is much more important than the voltage and capacity indicators. And it is often worth paying attention to the torque only if it will be used not only for screwing in, but also for drilling. You should also know that the maximum power of a cordless screwdriver of all commercially available models has a device with a voltage of 36 V, a torque of 60 Nm and a capacity of 3000 mAh. Such equipment is rather difficult and not very convenient to use without professional experience. And, therefore, you should opt for less productive options produced by well-known and reliable brands such as Bosch, Hitachi, Makita, AEG, Dewalt and Metabo.

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How many amperes does a 14 volt screwdriver consume? I want to attach a power supply to it.
I thought maybe a power supply from a laptop would fit (16V 5A), if it’s weak, then I think you can buy a more powerful power supply.

It consumes differently, from 5-7A in a lightly loaded mode, up to 10-15 and even up to 20-25A in dir. tightening on vehn. ratchet level. PSU is not convenient, now there is a sea of ​​modern batteries: lithium-iron-phosphate (LiFePO4), lithium-ion (Li-Ion) and lithium-polymer (Li-Pol), i.e. there is something to replace the old junk. In general, the problem is discussed on many forums, take a look here, for example, there is something to read on this issue:,3117.0.html?PH PSESS

How many amperes does a 14 volt screwdriver consume? I want to attach a power supply to it.
And what is the capacity (in A / h) of the battery of the screwdriver you have?

PSU is not convenient, now there is a sea of ​​modern batteries. those. there is something to replace the old junk.
Yes, there is a replacement, but separately purchased batteries are very, very.
ZY I have a kit myself “Makita” with two Ni-Cd batteries at 12 V, 1.3 A / h, after full charging with the standard charger, unused batteries, alas, lose their charge in 2.3 days, i.e. there is a significant loss of capacity. The set of tools was purchased in 2007, was used infrequently.

Yes, there is a replacement, but separately purchased batteries are very, very.
ZY I have a kit myself “Makita” with two Ni-Cd batteries at 12 V, 1.3 A / h, after full charging with the standard charger, unused batteries, alas, lose their charge in 2.3 days, i.e. there is a significant loss of capacity. The set of tools was purchased in 2007, was used infrequently.

There is one good way to revive accom. This occurs in acc. NI-CD crystallization, and they do not hold the charge well. To destroy it, you need to apply for example. with high current. from welding KEMPI. Minus for minus acc., plus a wire several times to read on the positive terminal, smoothly. And you will be happy for another 200 charges, approx. discharges. Or a couple of acc. It is possible to connect in the afterbirth from the car. For Ni-Cd acc., it is necessary for long-term storage, do once a month two full discharge and charge. I have a screwdriver about 10 years old and works like a clock. But first try 3-4 cycles times. Try heating, and let’s cool down for half an hour, each time. I revived mine like this for the last time. But when it completely becomes a stake, then the above must be done. I rewind the start button with a wire until it stops. But look not to stand long when stopping. These acc. They do not like deep discharge. Otherwise, there will definitely be a kirdyk. And every time you lose power, when you work, do not be lazy, always discharge the battery to the end. This greatly affects the durability. I personally always do this, and it works for years.

For some work, you have to tighten a lot of self-tapping screws. You can, of course, do this manually with a screwdriver, but this requires significant effort and takes a long time. To speed up the process, you need to choose a screwdriver. There are quite inexpensive models. household ones. which, nevertheless, greatly facilitate the installation and dismantling of screws. And some can work in drill mode.

Household or professional

As you know, professional screwdrivers are more expensive, but this is not accidental. They are made with a large margin of safety, for which higher quality and more expensive materials are used. In addition, they have more power, which makes it possible to screw in longer screws and / or work with tougher materials.

The difference between a professional and a household screwdriver in a resource

To decide a household or professional screwdriver you need, estimate the amount of work that will need to be done. If you are starting a construction or major renovation, you probably need a professional or semi-professional model. If the tool is needed periodically. to twist / twist something from time to time, everyday life is more than enough. With such work, the resource of a professional tool will simply not be in demand. So choosing a screwdriver by this criterion is not very difficult.

Reverse or reverse

This option allows you to unscrew a screw or drill bit stuck in the material. The change in the direction of rotation occurs when the polarity of the power supply is changed, which is carried out through a special button. It is usually installed close to the trigger.

Examples of the location of the backstop button in a screwdriver

Most often, the button for switching the direction of travel has three positions: on average, the tool is locked. This increases safety: if you accidentally touch the lever, the screwdriver will simply stop, rather than immediately start to rotate in the opposite direction.

Battery parameters

To choose the right screwdriver with batteries, in addition to the type of batteries, you must select their operating parameters:

  • Capacity. Reflects the amount of energy that can be stored. It is clear that the larger this parameter, the better (but also more expensive).
  • Voltage. There is a rechargeable battery for a screwdriver for 10 V, 12 V, 14.4 V. Household models usually go with such parameters. A more serious tool works with 18 V and 24 V.

What characteristics to choose a screwdriver?

To choose a screwdriver for home or professional use and not regret, you must view these parameters. If you have picked up several models, compare them according to these characteristics, because it depends on them how long the interval between the charges of the screwdriver batteries will be.

Chuck type

The screwdriver chuck is of two types: key and keyless. The quick-release (usually has three petals) allows you to change the nozzles in a matter of seconds. the cartridge is turned a little by hand, the nozzle is changed, after which it is turned a little in the opposite direction again. In addition, there is one more positive point: in such a holder it is fashionable to install a nozzle of any thickness. The main thing is that the shank fits into the holder.

Types of chuck for screwdriver

The same operation with a key chuck requires a special key. It is inserted into a special socket, rotated until the nozzle is free. After replacement, the key turns in the opposite direction. The disadvantage is obvious: you must have this key at hand.

By structure, keyless chucks can have one or two couplings. If there are two couplings, one of them fixes the chuck, the second. the shaft. If there is only one coupling, then there is a shaft locking button on the body.

It is not difficult to choose a screwdriver according to this parameter. usually everyone converges on quick-clamping ones. They allow you to fix nozzles of large sizes, although they are a little more expensive, other things being equal.

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Normal vehicle battery voltage. Under load and without it, let’s not forget about winter.

The voltage of the vehicle battery, as well as its capacity, are the most important indicators of this automotive unit, on which its functionality and quality of work directly depend. Batteries are used to start the power unit, so every car owner should be aware of the normal voltage of the car’s battery, constantly maintaining it in working order. Of course, I have already touched on this topic in previous articles about batteries, but today I want to concretize this information.


  • Standard for the basic properties of the battery
  • Under load VIDEO
  • A few words about electrolyte
  • Reducing tension in winter VIDEO

To begin with, I would like to say that in modern cars there are no longer devices with the measurement of “Volts”, although they used to be. Therefore, in order to determine the voltage, you first need to get a multimeter, read more about it here. I want to note that it is advisable to check the battery voltage at least once a month or twice in order to take action in time.

Under load

Voltage can be divided into three main indicators:

  • Nominal;
  • Actual;
  • Under load.

If we talk about the nominal voltage, by the way it is customary to indicate it in the literature and other materials, it equals. 12V, but downright this indicator is far from the actual parameter, I am silent about the load.

As we said, the normal operating voltage of a car battery is 12.6. 12.7 volts. But in fact, the actual indicator is more reliable, which can range from 12.4 volts to about 12.8 V. I want to emphasize. this parameter is removed without load, which is said at rest.

But if you apply a load to our battery, then the parameters will be completely different. The load is mandatory, this test shows the battery’s performance, because often all batteries can withstand the normal voltage, but the “dead” ones cannot withstand the load.

The essence of the check is simple. on a fully functional battery, create a load (using a special apparatus. “load plug”) twice its capacity.

That is, if you have a battery with a capacity of 60 Amps / h, then the load should be 120 Amperes. The duration of the load is about 3. 5 seconds, and the voltage should not sag below 9 Volts, if the indicator is 5. 6, then your battery is either discharged or almost “dead”. I would also like to note that after the load, the voltage should be restored in about 5 seconds to the normal level, at least 12.4.

In case of a “drawdown”, the first thing to do is to charge the battery, and then repeat the experiment with the “load plug”, if a large drawdown is not noticed, then the battery needed to be recharged. Watching a video about load testing.

A few words about electrolyte

The main parameter that determines the voltage level in the battery is the density of the electrolyte that is inside this device.

When discharging the battery, acid is consumed, the proportion of which in this composition is 35. 36%. As a result, the density level of this liquid decreases. During the charging process, it performs the opposite process: the consumption of water leads to the formation of acid. the result of which is an increase in the density of the electrolytic composition.

In the standard state at 12.7 V, the density of this liquid in the battery is 1.27 g / cm3. In the case of a decrease in any of these parameters, the other also decreases.

Standard for the basic properties of the battery

How low must this value be to start the engine? There is no exact indicator here. In the standard state, this property for a fully charged battery should average 12.6-12.7 volts.

Depending on the specific conditions, this indicator may vary slightly, and there is nothing wrong with that. For example, some manufacturers assure that their products have a voltage of about 13-13.2 V, this is permissible, but I want to warn you right away.

You should not measure the voltage immediately after charging the battery, as many experts write, you need to wait at least an hour, then it should drop from 13 to 12.7 Volts.

But it can walk in the other direction when it drops below 12 volts. this indicates that the battery is discharged by 50%.

In this case, the device will need urgent charging, since its operation in this state is guaranteed to lead to sulfation of the lead plates. This reduces both the performance of the battery and the duration of its operation.

But even in the case of such a low voltage, it is quite possible to start the motor of a car. If the battery is in working condition, it does not require repair and the generator, when the engine is running, charges the battery, the device can be safely used even in this state.

In the same case, when this electrical parameter of the battery falls below 11.6 V, the battery is almost completely discharged, its further use in this state without recharging and checking for operability is impossible.

Thus, the normal voltage level is in the range of 12.6. 12.7 Volts (rarely, but possibly up to 13.2 V. maximum.)

However, in practice this is very rare. Most often for cars it is 12.2-12.49 volts, which indicates an incomplete charge.

But there is nothing wrong with this: a decrease in the performance and quality of the device begins if there is a decrease to 11.9 volts or below.

Reduced stress in winter

Car owners often complain that in winter, during severe frosts, its main parameters drop in the battery, as a result of which the car will not start. Therefore, some drivers take the battery into the heat at night.

But in reality, this is not quite the case. At negative temperatures, the density of the electrolyte changes, which, as already noted, affects the voltage level. But with a sufficient battery charge, the density of the electrolyte in cold weather increases, as a result of which the second of the most important properties also increases. Therefore, a sufficiently charged battery does not threaten anything even in severe frost. If you leave it discharged in frost, the density of the electrolyte will decrease, as a result of which there will be problems with starting the car’s engine, possibly even freezing.

Problems with using and starting the power unit of a vehicle in winter are not associated with a decrease in the main parameters of its battery, but with the fact that the main chemical processes inside it at negative temperatures are slower than in normal times.

Therefore, with a normal charge, the level of density and voltage of the battery will be sufficient to start the car engine even in winter frosts.

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Now a short video.

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Screwdriver, how to choose

One of the most common tools among craftsmen is a screwdriver. In terms of popularity, it is located, perhaps, immediately behind the drill, although it includes some of its functions. The main purpose of this tool is to screw in screws, or rather to screw in self-tapping screws.

Let’s take a look at the basic requirements to consider when choosing a screwdriver. They are divided into two main types, and these are network, operating from a 220 volt household network, and rechargeable, respectively, from a battery. Since network screws are not widely used, we will not specifically consider them, but just say that many selection parameters automatically become relevant for network screwdrivers.

How many volts should the screwdriver be?
The battery voltage of a screwdriver directly affects its power. From the course of school physics, we know that power is equal to the product of voltage and current. It follows from this that the higher the operating voltage of the battery, the higher the power of the device. Of the screwdrivers on the market, battery voltages are 6, 12, 18, 24 and 36 volts. This voltage is always indicated by the manufacturer on the product label.

How many watts should a screwdriver be?
This issue was partially covered in the previous paragraph. But it is worth summing up, the more powerful the screwdriver, the more comfortable it is to work with it. It should be borne in mind that the power of the device must correspond to the battery. The capacity of the battery must be calculated for the energy consumption of the motor, which is built into the screwdriver. If the ratios are wrong, you can end up draining your battery quickly. It should also be noted that the more powerful the device and the more powerful the power source, the higher the weight and dimensions of the tool. Well, as a result. a higher price of a screwdriver. If we consider the power of the battery, then most likely it is more correct to say not the power, but the capacity of the battery. It is measured in ampere hours and denoted as Ah.

Screwdriver, with which battery to choose?
In household appliances and tools, there are three types of unattended batteries: nickel-cadmium (Ni-Cd). Nickel metal hydride (Ni-MH) and lithium-ion (Li-Ion). The first and second have a huge disadvantage. memory. Over time, these types of batteries do not fully charge and discharge. This results in a loss of cell power, or, quite simply, the loss of our precious ampere hours. In addition, the average number of charges and discharges is 1000 cycles. With intensive use of the tool, the batteries will quickly fail. There are various ways to resuscitate such containers, but this is quite problematic, and they are not fully restored and not for a long time. Lithium batteries do not have a memory effect, but they do not tolerate extreme temperatures well. But such batteries are more durable and much lighter than their counterparts. The payback for owning a lithium-ion battery will be the higher cost of a screwdriver.

What should be the moment in a screwdriver?
An explanation is needed here. This refers to the tightening torque of the screwdriver, or rather, the torque. For car enthusiasts, the expression “torque” is probably familiar. In order not to burden you with definitions, I will simply say. the tightening torque is the maximum constant load on the screwdriver, at which the device can continue to screw in at a constant speed. The higher the torque, the longer and thicker the screws you can drive into walls and other obstacles. The moment is measured in newtons per meter and is abbreviated as Nm. It is advisable not to buy screwdrivers with a torque below 10-12 Nm.

Screwdriver, with which rotation speed to choose?
Here you have to define for yourself. If you want to use the device only for driving screws, then this is one thing, and if there is a desire or need to drill something inadvertently, then this device should have completely different characteristics. Speaking about the characteristics, we will mean the rotor speed. For standard screwdrivers, it is about 750 rpm. There are also two-speed models that can be more expensive, but here you already get two speed ranges. For example 750 and 1200 revolutions. Is second speed really important for a screwdriver? It’s hard to say, because the work in either case will be done. With small volumes of screwing, you will not feel this at all, but the screwdriver in the role of a drill has already completely flashed on the horizon. But here again, the speed of a full-featured drill averages 2400 rpm. If your screwdriver is capable of this, then good. The opposite situation is when they want to get a screwdriver from a drill. This will not really be an equivalent exchange, since the drill does not have a friction clutch. A clutch is a device that is configured to operate at a certain torque value. If you tighten small self-tapping screws, then set the trigger moment less. Otherwise, at a big moment, the screwdriver will drive the self-tapping screw so deep that this can cause rejection of the wall, board and other parts into which this screw was screwed. The drill has no friction clutch by default.

Is it worth taking a screwdriver with a punch function?
A hammer drill is a function of a drill and it serves to drill stubborn surfaces such as concrete, brick, etc. If you want your screwdriver to work even for a good drill, then feel free to purchase a model with such a “twist”. Otherwise, this is a redundant function and should not be overpayed for. Be sure to read the article Why isn’t concrete being drilled? Drills burn and break.

Screwdriver, which one to choose?
precisely, the question posed sounds like a screwdriver of which manufacturer to choose. In this situation, the choice is up to you. We have discussed all of these selection factors. You just have to proceed from the parameters of convenience, price and personal sympathy. We will not list famous brands and tell you about their advantages and disadvantages. You work with the instrument. Take a look. whether it is comfortable to lie in your hand, whether it will not be heavy when performing long work, etc. We are sure you will get what you need!