The word "accumulator" comes from the Latin "accumulo" - to accumulate, collect. That is, this device is designed to accumulate and save electricity. In the article, we will consider in more detail the types of these devices used for screwdrivers (household and professional). The most important parameter of this device is the capacity. It displays the period of time for which the battery is able to provide the declared current strength. The second most important parameter is voltage. Screwdriver batteries have a voltage of 9V to 18V.
There are the following types of these devices:
Nickel-cadmium batteries for screwdriver. They have a long service life (up to 1000 discharge / charge cycles); short time required for recharging; tolerate high / low temperatures and high charging current. The disadvantages include a high self-discharge rate (if the battery has not been used for a long time, recharging will be required), the complexity of disposal. It is also necessary to strictly observe the rules of charge / discharge: ifcharge a battery that is not completely discharged, crystals form on the plates, reducing the capacity (the so-called “memory effect”).
Nickel-metal-hydride batteries for screwdriver. Advantages: service life - about 1500 "charge / discharge" cycles, no "memory effect", increased capacity. Disadvantages include high cost, poor tolerance to low or high temperatures, and the fact that they do not tolerate high discharge rates (long-term operation at high power).
Lithium-ion batteries for screwdriver. The positive aspects include: large capacity, no "memory effect" and self-discharge, short time required for charging. Disadvantages: do not allow the battery to completely discharge (after several complete discharges, a new battery may be needed); during long-term storage, it loses part of its capacity (when buying a tool, pay attention to the date of manufacture, otherwise you will get a device that does not have the parameters that are stated at all); does not respond well to low temperatures.
Due to the existing differences, all batteries are conditionally divided into models for household and professional screwdrivers. It’s clear why: professional ones should provide longer battery life while having less charge time. If you plan to work with a power tool all the time, you should think about purchasing a second battery: while one is in operation, the second one is charging. In this way, you can provide a decent amount of time for uninterruptedwork. When choosing a battery, please note that some tool models can work with several types of such devices (information on this is available in the product data sheet).
Quality of workmanship and reliability of work are decisive indicators that must be taken into account when choosing. With equal technical characteristics, preference is often given to more well-known brands, despite the fact that their price is higher. For example, the battery for a Bosch screwdriver is in good demand due to the manufacturer's reputation. But this does not mean that the devices of other brands work worse, or are made of less quality. Another sales leader - the battery for the Hitachi screwdriver - is also in demand due to the "hype" of the brand.