I would give up on this, but every time it stops charging and says "full" I let it sit overnight, and the voltage is coming up just a little every day. I am using a 24 volt pulse charger on the two floor scrubber batteries as, that is how I will need to charge them once installed. Voltage after an over night rest was about 16v when I started. Up over 22v now. Not in a huge hurry (darn good thing!!!!) so will give it some more time. These batteries are about $600 a pop; still hopeful.
The other two are a lost cause.
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