- Jul 22, 2020
After spending many months testing around 1,000 batteries, I sorted them into mAh test results, from 2400+ right down to "1011 (the crappy batteries from tool packs.)" The lower mAh batteries I'll use in torches toys whatever, midrange place back into 2 laptops and 2 scooters I have and the rest for powerwall use. I am now checking the voltages after they've been sitting for several months and also internal resistance. Question is, how should I sort for optimum safety and power in powerwall use. My thoughts are sorting to 'those that retained perfect voltage' after sitting and then sorted again 'by resistance' thinking that maybe the mAh doesn't matter so much although I'm keeping them in the original test batches.... ie: I checked first (at random) all the 1800-1899 mAh lot and then sorted by retained voltage (some I'll use lost .01v and some up to .03v) and those that lost .2v or more I moved to another batch I'll use for other less critical stuff. I'm guessing I'll get less "heaters" and it'll prove safer sorting this way for a powerwall application, any thoughts Pete or anyone else on this.