Dogpatch
Ram Guru
I’ve had pretty good luck using a NOCO Genius battery charger. The one I have is a G7200 with “repair mode” and can de-sulfate and recharge a battery back to life from the dead. They claim from as low as 1 volt. It's worked for me a couple of times.I tested it with multiple testers and all cam out around cca of 1008 ish. I've already got it on a trickle.
I'm going to try and revive the old one and use it for spot welding my 18650 battery packs.
There is a newer version of what I have.
Here’s a link and a picture.
NOCO GENIUS10 6V 12V 10A Smart Battery Charger For Trucks, SUVs, Cars, Diesel Trucks, & RVs – Automatic Charger, Maintainer, Trickle Charger
The NOCO GENIUS10 is a compact yet powerful 6V and 12V 10A smart battery charger, maintainer, trickle charger, and desulfator for lead-acid and lithium-ion batteries, including automotive, marine, and deep-cycle types such as flooded, gel, AGM, SLA, maintenance-free, and LiFePO4. Compatible with...

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