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Originally Posted by secondcurve
RG:
I stagger mine so that I am replacing one a year. Again, overkill but I like to feel safe.
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Been told on more than one occasion that a weak battery will pull-down a strong one. So, the rule has been, if one battery needs replacing, replace all. Saves a walk or a row.
Speaking of a row, you should have a rowboat as final backup on an island, in case of a powertrain failure - healthy battery(s) will be of little use; although the jump-pack might double as an anchor.
