In article , Bennett Price wrote:

And to add to the above, if the batteries were sitting around for a year
w/o charge, (and were old to begin with), they are probably completely
dead.

That is indeed possible if not likely.

If they are 12 volts, you could take your car battery out and
temporarily hook it up to the UPS to see if it would work. Or string
together a bunch of flashlight batteries, preferably rechargeable.

Please do NOT try this unless you really know what you're
doing. And if you really knew what you were doing, you'd
know enough not to do this.

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