Quote:
Originally Posted by thingstodo
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..
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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.