Submitted by Craig1965 on May 15, 2018
So everyone has beaten the best charge limit question to death. We all KNOW it is best for battery longevity to be between 50 and 70% charge. A little lower or higher won't make much of a difference. A lot lower or higher will decrease battery life if done routinely. But the bigger question is:
If I have a 75D and a home wall charger that is charging at 48 Amps, obviously it is no where near as fast as a supercharging station, but is it degrading the battery life? The real question is every night at home, what is the best Amps to charge it at for battery health/life? 48, 40, 30, 20, 15 Amps??? And please no comments from non-electrical engineers, non-Tesla employees, or lithium battery newbs. I have extensive knowledge of lithium batteries and know most are best charged at 1 or 2 C. Which means for a 75 pack, 1 c would be 75 Amps, 2 c would be 150 amps. Obviously only a supercharger is doing that. So even at the maximum home charge of 48 amps, even with a 75D you are charging at <1 C, more like .64 C to be exact, which is well below the optimum safe charging of 1C for a lithium battery.