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Batteries are fully charged to 13.3 volts each. Trickle charge current flows when power is on. When AC power removed, I get power to the backup receptacles for about 2 seconds, then I hear a relay click and they turn off. Under this condition, the yellow light is on steadily (even after the receptacles click off). I do not see a red light (alarm) under any conditions. So I think the batteries are good (I tried it out with a fresh battery too and the problem remains).
From original poster: yes, the batteries were indeed bad. Showed full voltage on a voltmeter but had no discharge capacity at all. Batteries replaced, unit works properly now.
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