TOP-15 best batteries for electric screwdriver-review, characteristics and rules of choice
For household screwdrivers, batteries with a capacity of 1.3 to 2 a/h are usually used. Professional models are presented more stringent requirements for the duration of work, and the battery with a capacity of less than two amperes/hours for them are not used.
The power tools usually install batteries with a voltage of 3.6-36 V. often these are values from a series of 24,18,14,4,12 V, multiple 1.2 V. Voltage over 36 V is usually not used for security reasons, since the necessary isolation will affect weight, dimensions, complexity and reliability of the model. For the new Li-Ion batteries, the multiplicity is 3.6 V, which allows you to reduce the number of batteries and reduce the dimensions of the compartment.
For household models, the charge rate lies within 2-12 hours, and for professional screwdrivers 0.5-1 hours. Modern models with LI-Ion AKB are equipped with pulsed charging devices that accelerate the process.
The number of permissible charging cycles, the durability of the battery, the level of self.discharge, the features of operation directly depend on the type of battery. Let us consider in more detail which batteries 18650 are better for an electric screwdriver.
What is the design of the battery for an electric screwdriver
The battery is a plastic case in which several small batteries connected by contact tape are located. The ends of the tape come out and look like oblong plates. The main task of the battery is to produce direct current using the electrolysis process.
Squads for screwdrivers are distinguished by various technical characteristics
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Each battery consists of such elements:
Directly in the power tool itself there is a special hole where the battery housing is placed. And reliable consolidation is provided by two terminals located on the sides of the battery. Many manufacturers of screwdrivers, a battery may have a detachable case, although professionals have learned to carefully disassemble whole batteries for screwdrivers without harm to them. In order to open the case, just use the screwdriver, which is unscrewed by the fasteners.
Mini batteries located inside the case are distinguished by a cylindrical shape. The number of power elements depends on what voltage is necessary for the device. It can be 8, 10 or even 15 elements, which are usually placed in several rows.
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It is interesting! Batteries for electric screwdriver are connected with a tape, the basis of which is nickel. Internal elements are connected in a sequential order, standard. from minus to plus. To fix the tape to the batteries, point welding is used.
Some screwdrivers are sold with two batteries
The production of current in the battery occurs due to the potential difference on the cathode and anode. All batteries have different properties. The main characteristics that are interesting to users include:
- material used for the manufacture of the pole and electrolyte;
- voltage affecting the productivity of the device;
- a container that determines how much time you can work with a device without recharging.
The voltage of the battery is determined by the number of batteries built inward. One element, as a rule, has a charge from 1.2 to 3.9 volts. Thanks to the sequential connection, the required amount of volts is gained. For the work of a household tool, a 10.8–14.4 V indicator is enough, but a professional device for normal operation needs 18–36 V.
The battery capacity to the screwdriver determines the maximum operating time. This indicator primarily affects the current consumed by the device, as well as the voltage with complete discharge.
The battery capacity affects the battery size
Types of batteries for screwdrivers
On sale you can find several types of batteries for screwdrivers. Each type of battery has its own advantages and disadvantages. Varieties represent the following batteries:
Most of the models of screws are equipped with nickel-cadmium elements. These are the simplest capacious batteries of low cost. Nicd Battery has proven itself as a durable power element. It lasts about ten years. Due to the persistent tolerance of low temperature, the screwdrivers can work in the winter season in the open air without a sharp decrease in the charge.
Nickel cadmium battery for a screwdriver with a voltage of 12V during the entire service life experiences more than a thousand charges and detachment. One of the advantages of the battery is that it can be stored for a long time completely discharged without loss of performance.
Important! The screwdrivers work until the NICD battery is completely discharged, without fear of a decrease in its qualitative characteristics.
Along with this, it is worth noting some disadvantages of nickel-cadmium elements. The battery block is quite heavy. When working with him, the employee’s hand quickly gets tired. Also, the battery of this type for screwdrivers is subject to “memory effect”. If the battery is put on the charger not completely discharged, then it will “remember” the level of capacity. Subsequently, the battery will lose performance, reaching this level of charge.
To get rid of the “memory effect”, specialists developed new batteries. These are the so-called nickel-metallhydride (NIMH) batteries for screwdrivers. Compared to NICD elements, new batteries began to weigh less. The effect of memory is slightly manifested.
The battery housings became more durable and steadfastly transfer random dynamic loads. Meterogolide elements are more durable and withstand up to 1,500 charging cycles.
However, these batteries have their shortcomings. They cannot function in open space at a negative air temperature. A small container does not allow a screwdriver for a long time. Batteries cannot be brought to complete discharge. The service life leaves much to be desired (4-5 years). To the minuses should add high cost.
Lithium-Ion-type batteries noticeably win the above battery. With the advent of Li-Ion elements, the problem of “memory effect” was solved. You can charge batteries in any condition without fear of losing the capacity.
Shurovyrt does not lose power until the lithium-ion battery is completely discharged. The service life reaches 5-8 years. The storage batteries are practically not self.discharge. Full charging occurs within 40-50 minutes.
The disadvantages of the LI-Ion batteries include sensitivity to the slightest hull strikes. The battery may explode from a height as a result of falling. When working at low air temperature, the battery is rapidly discharged. Their high cost should be noted.
Today, lithium-ion batteries are actively promoted by manufacturers, the area of their use is expanding. Of course, they have their own pluses, but they also have no less disadvantages.
- specific container (it is 2 times larger in comparison with nickel-cadmium batteries);
- Small weight and overall dimensions,
- the highest electric density;
- There is no memory effect (therefore do not require a complete category).
- poor tolerance of negative temperatures (despite the statements of manufacturers, the electrolyte is still freezing),
- the maximum service life is only 2-3 years (from the day of manufacture),
- requirements in circulation,
- explosion hazard (although electronic protection is provided that control the working parameters of the battery),
- the impossibility of recovery,
- high cost,
- the need to use exclusively “native” charger.
If we talk about the use of lithium-ion batteries in power tools, the main factor by which they undoubtedly ahead of other available technologies is a very large capacity. In this regard, the optimal sphere of use of Li-Ion will be such tools as disk saws, angular grinding machines (“corner grinder”), peorators.
Features of choice
The choice of the battery model depends on the purpose of its use. To perform small and rare tasks in the house, there will be enough option based on nickel-cadmium. This variety of batteries is not terrible the prospect of long downtime without use and in discharged state.
When using the tool for professional purposes, it is better to give preference to lithium-ion analogues that will provide him with a long job. But in this case, it is necessary to ensure that the energy is not completely exhausted.
It is worth considering the duration of the device. Cadmium.based elements are more light, but have a smaller number of cycles (up to 500 reloading) than lithium.
It is important and the aging time of the battery. Nickel-cadmium devices wear out as the cycles are generated, and lithium-ionic ones become unusable with the course of the service life. The latter can fail after 5 years, even if they were not used.
Decryption of marking 18650
Additionally, depending on the composition of the battery, the following marking is given:
There are quite a lot of information on the network on which 18650 is suitable for screwdriver. In places it is contradictory or not true. To buy the desired lithium battery for the tool, you need to pay attention to important characteristics.
Lithium-ion batteries are divided into 2 types:
- High.volume (capable of issuing 10 and current without harm to the battery).
- Low.cut (give up up to 10 amperes or less). When working with a current force of more than 10 and it is possible to fail the battery and voltage subsidence.
At idle, the smallest amount of current is consumed. up to 2 A. In operations with fasteners or drill, household screwdrivers reach 10-20 A, professional units-40-50 A. Accordingly, in short-term mode, household tools withstand up to 30-40 amperes, professional-up to 60-80 ampere current.
In order to avoid strong voltage subsidence and reduction of power under load, it is recommended to reduce the internal resistance of the battery.
The presence of a built.in controller
The battery of 18650 may include or not include the controller. monitoring the amount of charge, temperature and load current.
Such a controller is located in front of the minus terminal on top of the case.
The installation of interruptions is optional when batteries are used, for example, to create a current of 12 volts and there is a common charge controller.
List of known microcircuits used by controllers:
- DW01. Consists of 6-lee fees and field transistors connected by a special assembly into one building. Transistors create a measuring shunt. Thanks to parasitic LEDs, charging the battery is possible even when the mechanism protecting from deep discharge is triggered.
- LV5114OT. triggers at a voltage of 2.5 to 4 V;
- S-8241 Series-triggers at a voltage of 2.3-4.3 V;
- R5421N. triggers when redesigned.
The presence or absence of battery protection
Li-Ion batteries exist with and without. A special fee that performs certain functions is responsible for protection:
It is allowed to use only batteries without protection, t.to. The protective fee works at a current force of 6-10 amperes, and working with the tool provides for a current strength of more than 10 and at a load. Accordingly, the functioning of the screwdriver when using the battery with protection is impossible.
Is it planned to create magnesium batteries and their introduction to everyday life?
In the late 2010s. American scientists created a magnesium-chromium battery, excluding the possibility of overheating when recharging or in hot weather. It also differed from Li-Ion and Ni-CD environmental friendliness and an increased service life.
In 2011, it was also planned to create a magnesium-gray battery with a greater specific energy intensity than the predecessors-over 4000 VCh/l.
At the moment, the magnesium batteries have not received widespread and so far are not used to charge screwdrivers.
Criterias of choice
Important parameters when choosing a battery for portable instruments are:
- The mass of the battery. the power source should not greatly weight the tool, especially if it is intended for professional use throughout the working day;
- capacity. it must provide autonomous operation of the device for the right time;
- voltage. its value should correspond to the nominal voltage of the tool;
- High and stable current rendering. it depends on it whether the battery can provide a current sufficient for the efficient operation of the device;
- resource-it is determined by the number of cycles of the charge-discharge until the moment when the stockproke decreases by 20%.
AKB compatible with hitachi screwdrivers
Nickel-cadmium battery with a capacity of 2 A × h and voltage 12 V. Consists of 10 cylindrical elements HYCPSC2000N, size. SC. For charging, chargers from Hitachi batteries are suitable. It has the form of clips.
Nickel-cadmium battery for Hitachi tools. Voltage. 12 V, capacity. 1.5 A × h. Charging time. no more than 90 minutes.