A recharge cycle (or charge cycle) refers to the process of charging a rechargeable battery from 0% to 100% and then discharging it back to 0%. It is a complete cycle of battery use and recharge.
A recharge cycle can happen two ways.
There’s a full cycle where the battery is charged from 0% to 100%, then the battery is used until it drops back to 0%.
The other, more common way is partial cycles, where the recharge cycle can also be made up of several partial charges and discharges. For example, charging from 75% to 100% and then using the battery down to 75% would be a quarter of a cycle. Four of those would be a full cycle.
The number of recharge cycles a battery can undergo before its capacity significantly decreases is a measure of its lifespan. For instance, a battery might be rated for 500 recharge cycles before its capacity drops to 80% of its original value.
Over time, as the number of recharge cycles increases, the battery’s ability to hold a charge decreases. This is normal wear and tear — called chemical wear — and it mean the battery will not last as long between charges as it did when it was new.
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source: https://www.zdnet.com/article/best-rechargeable-batteries/
