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>There’s no need to let it discharge 100% before recharging. Apple lithium-ion batteries work in charge cycles. You complete one charge cycle when you’ve used (
by chrisper 9y ago
>There’s no need to let it discharge 100% before recharging. Apple lithium-ion batteries work in charge cycles. You complete one charge cycle when you’ve used (discharged) an amount that equals 100% of your battery’s capacity — but not necessarily all from one charge. For instance, you might use 75% of your battery’s capacity one day, then recharge it fully overnight. If you use 25% the next day, you will have discharged a total of 100%, and the two days will add up to one charge cycle. It could take several days to complete a cycle. The capacity of any type of battery will diminish after a certain amount of recharging. With lithium-ion batteries, the capacity diminishes slightly with each complete charge cycle. Apple lithium-ion batteries are designed to hold at least 80% of their original capacity for a high number of charge cycles, which varies depending on the product.
From https://www.apple.com/ca/batteries/why-lithium-ion/ https://www.apple.com/ca/batteries/why-lithium-ion/
- mistercow 9y agoOh, I think I misunderstood your original comment. You were saying that she charged 90% each time, not charged from 90%. In that case, we're saying the same thing. Part of what I was talking about was, for example, I believe the Mac system profiler counts a cycle as any change from positive to negative discharge (or at least it did once upon a time), regardless of discharge depth. This gives Apple employees more opportunities to pull up your information and say "nope, sorry, your battery is expected to be dead after this many cycles", and make you feel like it's reasonable that you need to replace the battery.