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I have an older APC UPC, and the battery appears to be dead. It appears to be a small, lead-acid 12 battery - is it possible to revive the battery?

It's certainly not worth it to replace it - a new battery, even a no-name, is about $50 shipped - a whole new UPS, with similar specs, is only $65.

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CAUTION: If the battery is bulged (even a little, on any surface) or physically damaged in any way, do not attempt to revive it! Also, do not throw the battery in regular trash, it contains lead and should be properly recycled. – David Schwartz Oct 3 '11 at 18:05
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3 Answers

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The Battery University site is a good resource for various batteries.
How to restore and prolong lead-acid batteries and Charging the lead-acid battery.
Another reference -- Alton's Battery Page.

But, I'd just replace them (like I have once with my APC).

A Good reference page at BU.

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battery university is awesome – hayalci Sep 5 '09 at 22:58
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you can try to revive a Lead-Acid with a pulse charger.

one of the great disadvantages of Lead-Acid batteries: they cannot be stored in a discharged condition (the cell voltage should never drop below 2.10V)

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Get an cheapo car battery and hack the connector cable.

Let the vendor take the old battery.

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