Andy Hall wrote:
UPS. Admittedly, the ones in a UPS ought to be rated for deep discharge,
which a car battery isn't: but even living where he does, Dave's not
likely to run his battery flat all that often.

This can be addressed if you use leisure batteries. They are able to
stand somewhat more abuse than the regular car batteries.

I would suggest that's "different sort of abuse" rather than "more
abuse". If you tried starting your car from a 'leisure' battery it
wouldn't last long I don't think.

--
Chris Green