Accumulators for screwdriver: species, choice and storage

Sculptors on batteries are in demand as a type of tool and are widely used in construction and everyday life. However, the effectiveness and durability of such a device depends entirely on the type of battery installed in the instrument. Therefore, the choice of power source should be paid to special attention.

Advantages and disadvantages

High customer demand and a large number of positive feedback on rechargeable devices are due to a number of indisputable advantages of such models. In comparison with network devices, rechargeable screws are absolutely autonomous and do not need an external power source. This allows you to perform work on adjacent territories, where to stretch is technically impossible, as well as in the field.

In addition, the devices have no wire, which makes it possible to use them in hard-to-reach places where it does not get to the network tool.

As with any complex technical device, battery models have their weaknesses. These include greater, in comparison with network models, weight, due to the presence of a heavy battery, and the need to periodic battery charging.

In addition, the cost of some autonomous samples significantly exceeds the cost of networks operating from the network, which often acts as a decisive factor and forces the consumer to abandon the acquisition of battery devices in favor of electrical.

Views

To date, rechargeable screwdrivers are equipped with three types of ac- with nickel-cadmium, lithium-ion and nickel-metal-hydride models.

Nickel Cadmium (NI-CD)

Are the oldest and most common type of batteries known to humanity over the past 100 years. Models are characterized by high capacity and low price. Their cost is almost 3 times lower than that of modern metal hydride and lithium-ion samples.

Elements of power (banks) constituting the total block, have a nominal voltage of 1.2 volt, and the total voltage can reach 24 V.

The advantages of this species include a long service life and high thermal resistance of batteries, which allows them to be used at temperatures up to +40 degrees. Devices are designed for a thousand discharge / charging cycles and can be operated in active mode for at least 8 years.

In addition, a screwdriver, equipped with such a type of battery, can be operated until it is fully discharged, without fear of reducing power and quick failure.

The main disadvantage of nickel-cadmium samples is the presence of the “Memory Effect”, due to which It is not recommended to charge the battery until it is completely discharged. Otherwise, in view of the frequent and short recharging, the plate in the nutrition elements begin to collapse and the batteries quickly fails.

Another significant disadvantage of nickel-cadmium models is the problem of disposal of spent batteries.

The fact is that elements are characterized by high toxicity, which requires special conditions for conservation and processing.

This entailed a ban on their use in many countries of Europe, where strict control was established for the preservation of the purity of the surrounding space.

Nickel-metal-hydride (NI-MH)

Are more improved, in comparison with nickel-cadmium, batteries and have high performance characteristics.

Batteries have a small weight and differ in small sizes, which greatly facilitates work with a screwdriver. Toxicity of such akb is much lower, than the previous model, and “Memory effect” although there is a very weakly expressed.

In addition, the batteries are distinguished by high capacity, durable case and are able to transfer more than one and a half thousand charging cycles.

The disadvantages of nickel-metal hydride models include low frost resistance that Does not allow them to be used in negative temperatures, Fast self-discharge and not very long, in comparison with nickel-cadmium samples, service life.

In addition, devices do not tolerate deep discharge, for a long time they charge and expensive.

Lithium-ionic (Li-Ion)

Batteries were developed in the 90s of the last century and are the most modern battery devices. In many technical indicators, they noticeably won two previous types and are unpretentious and reliable devices.

The devices are designed for 3 thousand cycles of charging / discharge, and the service period reaches 5 years. The advantages of this species include the absence of a self-discharge, which allows not to charge the device after long-term storage and immediately proceed to operation, as well as high capacity, lightweight and compact dimensions.

In the batteries, there is no “memory effect”, which is why they can be charged at any level of discharge, without fearing power losses. In addition, the devices are quickly charged and do not contain toxic substances.

Along with a large number of advantages, lithium-ion devices have weaknesses. These include high cost, lower, in comparison with nickel-cadmium models, service life and low resistance to impacts. So, With a strong mechanical impact or drop from a high height, the battery can explode.

However, in the last models, some technological flaws have been eliminated, so the device has become less explosive. So, a controller of heating and battery level was installed, which made it possible to completely eliminate the explosion from overheating.

The next minus lies in the fact that the batteries are afraid of deep discharge and require regular control over the level of charge. Otherwise, the device will begin to lose work properties and quickly fails.

Another disadvantage of lithium-ion models is the fact that their service life does not depend on the intensity of the use of a screwdriver and the cycles produced by him, as it occurs in nickel-cadmium devices, but exclusively on the age of the battery. So, after 5-6 years, even new models will not be able to, Despite the fact that they never took advantage. therefore The purchase of lithium-ion batteries is reasonable only in cases where regular use of the screwdriver is supposed.

Design and specifications

The battery is rightfully considered one of the main nodes of the screwdriver, on how high the performance will be its operational properties, the power and duration of the device will depend.

Constructively, the battery is simple: the battery case is equipped with a lid, which is attached to it by means of four screws. One of the hardware is usually filled with plastic and serves as evidence that the battery did not open. It is necessary in service centers when serving batteries under warranty. Inside the case placed garland from batteries having a serial connection, which is why the full battery voltage is equal to the amount of voltage of all batteries. Each of the elements has its own labeling with operating parameters and model type.

The main technical characteristics of the accumulator batteries for the screwdriver are the capacity, voltage, and the time of the total charge.

  • Battery capacity It is measured in mat / h and shows how long the element is able to feed the load with full charge. For example, the 900 mA / h capacity indicator says that with a load of 900 Miliamper, the battery is discharged in one hour. This value allows you to judge the potential of the device and correctly calculate the load: the higher the battery capacity and the better the device keeps the charge, the longer the screwdriver will be able to work.

The capacity of most household models is equal to 1300 mA / h, which is enough for a couple of hours of intensive work. In professional samples, this figure is significantly higher and is 1.5-2 A / h.

  • Voltage It is also considered an important technical property of the battery and has a direct impact on the power of the electric motor and the magnitude of the torque. Household models of screwdrivers are equipped with 12 and 18 volts by 12 and 18 volts batteries, while in powerful devices, batteries are installed at 24 and 36 V. The voltage of each of the batteries constituting the battery pack varies from 1.2 to 3.6 V and depends on the model of the AKB.

  • Time of complete charge Indicates how much time the battery is required in order for charging to be complete. Basically, all modern battery models charge quickly enough, approximately 7 hours, and if you only need to recharge the device, it sometimes has enough 30 minutes.

However, with short-term charging, you need to be extremely cautious: some models have the so-called “memory effect”, in view of which frequent and short recharging them are contraindicated.

Tips for choosing

Before you start purchasing a battery for a screwdriver, it is necessary to determine how often and under what conditions the tool is planned to operate. So, if the device is bought for irregular use with minimal load, then it makes sense to acquire an expensive lithium-ion model. In this case, it is better to stop your choice on tested by nickel-cadmium batteries, with which nothing happens during long-term storage.

Lithium products, regardless of whether they are operated or not, must be kept in a charged state, while maintaining at least 60% charge.

If the battery is selected for installation on a professional model, the use of which will be permanent, then in this case it is better to take “lithium”.

When buying a screwdriver or separate acb from hands, it is necessary to remember the property of lithium-ion models to grow in accordance with its age.

And even if the tool looks like new and never turned on, then the battery in it is most likely not working. Therefore, in such situations, only nickel-cadmium models should be chosen or be prepared for the fact that the lithium-ion battery will soon be changed.

Regarding the operating conditions of the screwdriver, it should be borne in mind that If the tool is selected for work in the country or in the garage, it is better to stop your choice on “Cadmia”. In contrast to lithium-ion samples, they are much better tolerant frost and are not afraid of blows and falls.

For inappropriate work in the premises can buy nickel-metal hydride model.

They have a large capacity and have proven themselves as a home assistant.

Thus, if required inexpensive, hardy and durable battery, then you need to choose nickel cadmium. If you need a capacious model that is capable of long and powerfully twist the motor – this is definitely “lithium”.

Nickel-metal hydride batteries in its properties closer to nickel-cadmium, so to work with positive temperatures can be selected as a more modern alternative.

Currently, the majority of companies for the production of power tools are engaged in the production of batteries for drills and screws. Among the enormous variety of various models, there are popular world brands and inexpensive devices of little-known firms. And although in view of high competition almost all products presented in the market has high quality, Some models should be allocated separately.

  • The leader in the number of approving reviews and buying demands is Japanese Makita. The company is engaged in the production of power tools for many years and thanks to the accumulated experience delivers products only high-class products to the world market. So, model Makita 193100-4 is a typical representative of nickel-metal-hydride batteries and is famous for high quality and long service life. The product refers to high price batteries. The advantage of this model is a large charge capacity of a value of 2.5 A / h and the absence of a “memory effect”. The voltage of the battery is 12 V, and the model weighs only 750 g.

  • Battery Metabo 625438000 It is a lithium-ion battery and absorbed all the best characteristics of this type of products. In the device there is no “memory effect”, which allows you to charge it as needed, without waiting for a full battery discharge. The voltage of the model is 10.8 volts, and the capacity is 2 A / h. This allows a screwdriver for a long time to work without recharging and used as a professional tool. Installing a replaceable battery in the device is performed very easily and does not cause difficulties even among those users who produce a replacement of the battery for the first time.

A feature of this German model is its small weight, which is only 230 g. This markedly relieves the screwdriver and puts it on the comfort of use in almost one row with network devices.

In addition, there is such an acb quite inexpensive.

  • Nickel-cadmium model NKB 1420 HT-A charge 6117120 produced in China by Russian technology and is an analogue of batteries Hitachi EB14, EB1430, EB1420 and others. The device has a high voltage of 14.4 V and a capacity of 2 A / h. The battery weighs quite a lot – 820 g, which, however, is characteristic of all nickel-cadmium models and is explained by the structural features of nutritional elements. The product is distinguished by the ability to work for a long time on one charge, the presence of “memory effect”.

  • Cubic battery 1422-Makita 192600-1 is another representative of the popular family and compatible with all screws of this brand. The model is characterized by a high voltage equal to 14.4 V, and a capacity of 1.9 A / h. Weighs such a device 842 grams.

In addition to famous brand models, there are other interesting samples in the modern market.

Thus, Power Plant has established the release of universal batteries, compatible with almost all popular screwdriver brands.

There are such devices are much cheaper than native batteries and have proven themselves quite well.

Operation and service

To increase battery life, and to ensure their correct and stable operation, a number of simple rules must be observed.

  • Working with screwdrivers equipped with nickel-cadmium batteries, it is necessary to continue until the battery pack must be fully discharged. Store such models are recommended only in the discharged state.
  • To nicd devices quickly “forgot” unwanted charging level, it is recommended to drive them several times on the “Full charge – deep discharge” cycle. In the process of further work, recharge such batteries is extremely undesirable, otherwise the device can again “remember” unnecessary parameters and in the future will “turn off” exactly at these values.
  • Ni-CD or Ni-MH battery can be restored. For this, it is passed through it with short pulses of the current, which must be at least 10 times higher than the capacity of the battery. During the passage of pulses, dendrites and the battery is restarted. It is then “pumping” it with several “deep discharge – full charge” cycles, after which they begin to use in operating mode. Restoration of the nickel-metal-hydride battery occurs along the same scheme.
  • Restoration of lithium-ion batteries by diagnostic and pumping the selent element is impossible. During their operation, lithium decomposition occurs, it is absolutely impossible to reimburse its loss. The failed lithium-ion batteries are subject to exclusively replacing.

Rules for replacing batteries

To replace banks in a Ni-CD or Ni-MH battery, it is first necessary to remove it. To do this, you should unscrew the fastening screws, and in more budget models that are not equipped with a removable design, carefully pinched the block scroll and remove the battery.

If the case is embedded in the screwdriver handle, then you need to disconnect the block around the perimeter using a scalpel or knife with a thin blade, and then pull out. After that, it is necessary to open the block cover, dig or bite off with nipples from connecting plates all banks and rewrite information from marking.

Typically, such batteries are equipped with batteries with a voltage of 1.2 V and a capacity of 2000 mA / h. They, as a rule, are available in every store and cost about 200 rubles.

Sutting items need to be in the same connecting plates that stood in the block. This is due to the fact that they already have the desired section with resistance, which is necessary for the proper battery function.

If the “native” plates could not be saved, then instead you can use copper strips. The cross section of these bands should be an absolutely identical cross section of “native” plates, Otherwise, new plates will be very hot in the charging process and trigger the thermistor.

The power of the soldering iron when working with power elements should not exceed 65 W. Soldering must be performed quickly and gently, not allowing it to overheat items.

The connection of the batteries must be consistent, that is, “-” the previous element must be connected with “+” next. After the garland is collected, carry out a complete charging cycle and leave the design for a day alone.

After the specified period, the output voltage on all batteries is necessarily measured.

With proper assembly and high-quality soldering, this value will be the same on all elements and will correspond to 1.3 V. Then the battery is collected, installed in the screwdriver, include and kept under load until complete discharge. Next, the procedure is repeated, after which the device is re-charged and used by intended.

Everything about accumulators for screwdrivers – in the video below.

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