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It is also important to only connect batteries of the same type and capacity together to ensure compatibility during charging.

If you are connecting several batteries in parallel, then it is important to to connect the charging leads as follows: Negative lead to the first battery negative pole, and Positive lead to the last battery positive pole. This will ensure that each battery receives the same potential charging...

I think you are right, The older batteries will drag down the better batteries. Plus you can't really charge more than 2 or 3 at a time from a solar panel as you may overload the charging relay. Best advice is to install LED bulbs which do not use as much current from your battery. For further...