I am wondering about something.� I have 2 newer matched Walmart batteries and use one for camping stuff and one for starting & radio.� If one battery is topped up and the other is at say 75%,�does�the fully charged prevent the other one from getting charged? I wouldn't have thought so but I was seeing low voltages on one of both of the batteries while on an extended camping trip (driving a few hours at least every day).
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I was thinking that�whatever feedback the alternator gets might sees a full charge from the one charged up one?� I use a manual battery connect/disconnect switch�if that is relevant.
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Also wondering if I see 12.6 volts, does that mean the battery is fully charged and in good shape or do I have to load test it to know for sure?
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Thanks,
Dave