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I watched your cold charge video multiple times awhile ago. I'm aware that both discharge and charge performance are severely reduced. The reason I'm looking to test cold charging performance is to get the numbers for the full cycles instead of stopping the test and to also evaluate damage in...

Battery: PUPVWMHB 12v 100Ah mini https://www.amazon.com/dp/B0CYZQ7Y45/ (not an affiliate link) tl;dr Desired test results - Worst case cold discharge performance specs in terms of highest amperage I can draw with cold soaked battery at different SOCs. How should I test: My timeframe for...

Why do you want LiFePO4 in the AA form factor? The other lithium ion ones with the DC-DC converter inside have less energy density because of the conversion losses and the size of the DC-DC conversion electronics, the power connector, and protection circuit inside. The actual lithium cell...

I couldn't get one of the LiFePO4 test specimens, the one I'm going to theoretically destroy based on testing the common cold charging hypothesis, to accept 1c when I began a charge at 5 celcius(41f) when I brought it inside after a discharge test. It was likely warmer than that internally...

Nice to see those cells get some use, it's as if the sun isn't the highly variable commodity where you are like it is near the US/Canada border near all of our big lakes. Where I live, we could get clouds for weeks, snow covered solar, and short solar days even when it's perfect, so solar sizing...