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Old 12-20-2016, 01:46 PM   #41 (permalink)
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Originally Posted by thingstodo View Post
If your battery is charging at 90% efficiency ... it's time to retire it! I would expect 97% would be a bad day. Again - I must be missing something..
Charging a battery involves both a chemical reaction and electric passing through materials that aren't superconductors. Because they are not perfectly efficient, they both produce heat. Inefficiencies like these are seldom linear: the faster you do them, the more inefficient they become. More heat is produced, which makes them still more inefficient if that heat can't be removed.

I think what you're missing is that very few people can afford (or will be willing to pay, even if they could) to pay $20K or so to replace a battery pack on a regular basis.

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