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Originally Posted by krazy
Keep the one you have (assuming the electronics work fine and it's just the battery) and hook it up to a spare car battery. The battery in most UPSs is just a typical sealed lead-acid battery. I have heard of people replacing the small stock battery with a larger one or an array of them to get more uptime. I'd do some resarch first, but it should work.
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this is a good and bad idea. the car battery should function, but it's not necessarily the best idea in using in the office.
while it should function, and provide much more power than the factory batteries, there's a slight inherent flaw in the car battery that would not make (most of them) desirable.
most car batteries aren't sealed, like the ups batteries. they have a tendency to give off a nasty gas, that can be explosive (and probably not desirable to inhale a lot).
if you used a car battery, you should make sure you get a totally sealed model - not just a "maintenance free" unit. of course it would be better if you got a deep cycle as well, but you could probably get by just as well off a regular battery (depending on how much you used it).
at any rate, i don't know about the surge perfomance of these units, but i've never had any surges that my equipment noticed, so i'll assume they're good. i assume the batteries are shot because when the power dips, the units seem to switch over to battery and everything shuts off (no battery available, is my guess). i'd assume if i was overloading the ups, it would trip the internal breaker (been there, done that).
although for the price of a new set of batteries, they'd probably be cheaper than a good, sealed deep cycle car battery, but it's worth considering for closet units that aren't around people much. i guess i'm just worried i'm pulling too much power for my 350 & 400, but 1 system, that probably shouldn't be the case..