Laptop batteries have a life expectancy based on a limited number of cycles. New MacBooks for example, have a lifetime of 1,000 cycles while older models had 300 cycle batteries.
Cycles are calculated by using a battery’s power completely. This can happen either on a single charge or spread across many subsequent charges. If you use 20% of your battery, charge it, and then use 80%, this will result in a single cycle.
When a battery reaches it’s cycle count limit, it will still work but it will discharge faster than before.
It is good practice to let them discharge completely once a week but not necessary on every single charge as this will use up the cycle count faster.
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