"James Sweet" wrote in message
news:G9RAf.1956$zh2.313@trnddc01...

That would be a series system right? Two 12V batteries in series is
perfectly acceptable, two in parallel is not.

Dual battery systems use diode based isolators to keep one battery from
interacting with the other, I suppose you could use something like that
with a UPS.

That's perfectly reasonable, but isn't a large cell internally equivalent
to small cells of the same voltage in parallel?

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