What is the capacity of a lithium battery?

Capacity (Capacity) The amount of electricity a battery can give under certain discharge conditions is called the capacity of the battery and is expressed by the symbol C. The unit commonly used is the ampere-hour, referred to as the ampere-hour (Ah) or milliampere hour (mAh).

 

The capacity of a battery can be divided into theoretical capacity, rated capacity and actual capacity.

1) Theoretical capacity is the highest theoretical value obtained by calculating the mass of the active substance according to Faraday's law. In order to compare different series of batteries, the concept of specific capacity is commonly used, i.e. the theoretical power that can be given per unit volume or per unit mass of the battery in Ah/kg (mAh/g) or Ah/L (mAh/cm3).

2) The actual capacity is the amount of electricity that the battery can output under certain conditions. It is equal to the product of discharge current and discharge time in Ah, and its value is less than the theoretical capacity.

3) Rated capacity, also called guaranteed capacity, is the minimum capacity that the battery should discharge under certain discharge conditions according to the standards promulgated by the state or relevant departments.