I found it cheaper to buy a new one. Mine was about three years old when 2 banks went out. Called Cul-m-rite and did some tests they suggested. Banks were “definitely” bad. About 1 month ago was in the garage and decided to use the one good bank to charge a spare Battery. Come to find out all three banks are working now. ????? so I now have a “spare”. I think the chargers are good ones. Better than others I have had in the past. Just like anything electronic, there are gremlins. martin
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