Why does charging a phone battery partially instead of fully increase the lifespan of the battery?

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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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Anonymous 0 Comments

Because higher voltage puts more stress on the chemical constituents of the battery. So does higher temperature, which is mostly produced during the last stage of charging, when the battery’s inner resistance to current in that direction is high.

Other batteries have different vulnerabilities. For instance, lead-acid batteries are the most stable when fully charged, and I think NiMH don’t really care.

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