Cycle

In the battery industry, “Cycle” refers to a complete charge and discharge process of the battery. Specifically, a cycle includes a charge (battery energy is input from the outside) and a discharge (battery energy is output to the outside). A cycle does not necessarily mean charging from 0% to 100% and then discharging to 0%, but refers to the total charge and discharge capacity reaching the nominal capacity of the battery.
The number of cycles is one of the important indicators for measuring battery life. After a battery has gone through multiple cycles, its capacity and performance will gradually decay, so “cycle life” is usually used to indicate the number of cycles a battery can complete before its capacity drops to a certain percentage (such as 80%) of its initial value.