1 bad battery? or all
So I have a small 48v system look at signature. My problem is this my batteries deka gels 4 12v in series are losing charge and gaining charge quickly. yesterday after charge controller no longer provided power to them I checked the individual voltage 3 where 12.85V and 1 was down to 10.85 all pretty quickly about 1 hour after full charge from sun. So do I have 1 bad battery or are they all bad? They are 3 1/2 years old and do get abused some. I got the gels as I have the potential for them to freeze.
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