Why is it better to charge a Lithium Polymer battery to 80% (ish) than to 100% every time? I have heard this reduces wear, but why?
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Best comparison is rubber bands. Every time you charge it to full you are pulling the rubber band to its limit. This will cause it to fail sooner than if you only ever pulled it to 75% of its limit. This is why, on android at least, there is an option in the settings to limit the charging to ~75%
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