Why does charging a phone battery to 100% keep the discharge rate slower than charging to 90 or 80%?

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I have experienced it on multiple mobile phones and my laptop. If i charge the battery to 100% the discharge to 99% is way slower than if i charge the battery to 90% and discharge to 89%. And this makes me charge the battery to 100% even when I know that it is bad for the battery just because the charge lasts much longer than charging to 90 or 80%. Is it related to some kind of chemistry?

I am ok with eli 20 also. Thanks.

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6 Answers

Anonymous 0 Comments

A battery puts out fewer volts as it is depleted, so in order to get the same amount of energy, the amperage used must increase (watts = amps x volts)

Battery capacity is measured in amp hours (or really milliamp hours) so if you’re using amps at a faster rate, the percent remaining drops faster.

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