I bought a small C-Tek charger the other day, as I needed a new one anyway. I stuck it on one of the knackered batteries, and after 3 days it finally finished its stuff. The sight glass still shows black (discharged), but it's been running a 21w light bulb for the last 24 hours, so it's obviously held a modest amount of charge.
I've now connected the charger to the other battery that was originally showing white (knackered), but is now black. So we'll see what happens. I hope to maybe get something from one of them as I need a new battery for my small snow plow tractor, that spends all winter on a slow charger anyway.
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