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iPhone battery's capacity to hold electrical charge

iPhone battery's capacity to hold electrical charge

The AppleCare extended warranty covers the iPhone battery "when its capacity to hold an electrical charge has depleted fifty percent (50%) or more from its original specification." But how do I measure that capacity?

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Guest [Entry]

Whilst there are battery meters around, there's not really a way of measuring capacity without a full charge and discharge cycle. I think they mean that, compared to how long it lasted when new, it now lasts half as long after a full charge, with the same amount of usage. For example, if you always got 2 days of average use out of it before it complained about being down to 20%, and now you only get 1 day, then you can claim on the warranty. No idea how you prove the capacity has decreased to Apple though.