I recently got a SmartUPS 1400 and it had 2 12v 18ah batteries in series.
One had ruptured and the other still works but is not to full capicity. I
replaced them with 2 12v lawnmower batteries to see how long it would run.
It only has a runtime of 10 mins at 30% load.. ???!! I believe it is
oveheating or is shutting down on a timer, because when you plug it back in
it says the batteies are 95% charged. Has anybody ran into this before? It's
not draining the batteries much at all..

- Mike