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I'm just glad at least Tesla doesn't seem to do planned obsolescence with batteries, the way smartphone OEMs do with their battery irreplaceable smartphones that seem to last 2 years before the battery degrades significantly. Tesla's seem to lose about 5% after 10 years

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That's because Tesla has the room to properly cool the battery. Phones use batteries as heat sinks for their processors, and heat kills lithium batteries.

This is a reason not to use a thick case, and avoid charging your phone over 80% during the day.

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