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  Cordless power tools have become increasingly popular in recent years and for good reason. They offer several advantages over corded power tools, including portability, convenience, and improved battery technology. Parameters such as battery capacity, voltage, current and battery power not only affect the experience of using the device, but also directly relate to the efficiency and performance of the device. Therefore, understanding the relationship between these parameters is important for choosing the right lithium-ion product.In this article, we will explore how to select a battery for your cordless tools.

The relationship between battery capacity, voltage, current and battery power

1. Battery capacity
Battery capacity refers to the amount of charge that a battery can store, usually expressed in ampere-hours (Ah) or milliampere-hours (mAh). It determines the length of time the battery can continue to supply power.

Calculation formula: Battery capacity (Ah) = Current (A) x Discharge time (h)

Specific impact: the larger the battery capacity, the longer the battery can continue to supply power. For example, a 6000mAh battery can last up to 6 hours at a discharge current of 1A. Battery capacity directly affects the endurance of the tool, the higher the capacity, the longer the endurance.

2. Voltage
In a battery, the voltage determines how much power the current flows. The higher the voltage, the more power the battery provides at the same current, thus enhancing the power output of the tool. Higher voltage battery packs are able to provide higher torque and faster speeds, meeting the high demands of professional users for tool performance. In addition, high voltage battery packs reduce energy loss during current transfer and improve charging efficiency.

3. Current
In the process of battery power supply, the amount of current reflects the rate at which the battery supplies power to the outside world, expressed in amperes (A) or milliamps (mA). The higher the current, the greater the battery's discharge capacity and the longer the range. High-current battery packs are able to maintain a longer range with a consistently high power output, reducing the hassle of frequent recharging. In addition, high current battery packs are able to increase the working efficiency of the tool, allowing the tool to accomplish more work in a short period of time.

4. Battery power

Battery power reflects the speed of the battery to provide energy to the outside, expressed in watts (W) or kilowatts (KW).

Formula: Battery power (W) = Voltage (V) x Current (A)

The size of the battery power depends on the size of the voltage and current. Under a certain voltage, the higher the current, the higher the battery power, and vice versa. Higher power battery packs provide greater power output and enable tools to perform well under high load working conditions.

There are also some cordless tools on the market that use two battery packs at the same time, here is an example of an 18V, 2A battery pack to illustrate such a feature to you

When using two 18V 2A batteries in series, the total voltage increases to 36V and the current stays the same at 2A, which increases the total energy of the batteries, thus providing a longer range and more power to the tool. Although charging time will increase, this can be solved with a dual slot charger. But replacement work would require two additional batteries, which increases the cost.The use of a single battery, the replacement of which requires only a battery pack, saves money, but the range and power are not as good as two batteries used together.

So when choosing a battery pack for lithium-ion tools, you should consider parameters such as battery capacity, voltage, current and battery power according to your usage needs and work scenarios.