The UPS's seem to last 2 or 3 years and get replaced because replacing the batterys seems to cost alot.
You can make 240 or 110 volt AC with them, very handy. Smaller ones may work off a cars cigarette lighter socket.
Larger ones seem to need 50 odd volts DC to power them.
The batterys are lead acid, so they can be sold as car batterys.
They normally have capactors in them, they hold a lot of power for a while and can shock you badly.
I have only been shocked once, from a home stereo amp, last week... Quite a suprise....
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