Quote:
Originally Posted by mountainsam
I have always understood that the oldest battery will bring down an new battery to its level. Therefore always change out both. Now that is from a battery supplier, but one I trust.
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That may be true for batteries in parallel but for batteries in series the only way one can effect the other is by limiting the current flow either in or out, and that's the problem with mismatched series batteries: equalizing the state of charge with different "internal resistances". Best to replace both unless you just did and got a dud.