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6 Volt Batteries vs 12 Volt
WHY 6 VOLT BATTERIES ARE BETTER THAN 12.
For the same ampere hours, if you could get it all in one 12 volt battery, there would be no difference - a 12 volt battery has two 6 volt batteries in series inside it.
BUT for the same ampere hours, if it is going to take two batteries to do it because of size, weight, availability, etc., then rather than two 12 volt in parallel you are better off with two 6 volt in series.
Why is that you ask?
Because batteries in parallel, even if twins from the same manufacturer''s batch, will never be exactly identical, so one will always be a little weaker than the other and when charging ceases, the weaker one will discharge, or steal some of the charge from the stronger one through the parallel connection. This may be minor when they are new but as they age, the problem will get worse.
On the other hand, batteries in series can''t discharge into each other, so for that particular setup, the pair of 6 volt will be better.