My only experience with running 2 12-volt batteries in parallel is with
old Porsche 911s. In the early 70s Porsche stuck twin batteries (2 12
volts in parallel) as far forward as possible to improve weight
distribution. They were a constant problem. Unless they were perfectly
matched, the battery with the least internal resistance would get
charged and the other wouldn't. So while simply installing 2 batteries
in parallel might not be a good idea, there are undoubtedly ways to do
it today but they will be a little more involved than running an second
set of battery cables.
Charles Hill
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