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It doesn’t matter how well you treat your MacBook, your battery won’t last forever. When battery health degrades, leaving your charger at home becomes increasingly untenable since the time between charges can reduce dramatically.
The Obvious Sign: Reduced Battery Life
It should go without saying, but a MacBook with greatly diminished battery life should benefit from a battery replacement. There are varying degrees of battery degradation, from “a few hours less than what I remember” to the machine lasting single-digit minutes when disconnected from power.
As your battery ages, it will lose capacity as part of the normal aging process. Modern MacBook batteries are good for 1000 cycles before needing to be replaced, while older models typically withstand 300 cycles. You can see how your battery is affected by usage using the graphs under System Settings > Battery.
Ideally, you want to see a steady decline rather than sharp dips in charge level (unless you know you’ve…
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