One way I used to test standby and UPS batteries, without an expensive
tester, is to use a 50 ohm wire-wound resistor.. with a high wattage
rating. Putting it across the battery for about 30 seconds with a
voltmeter and watch the voltage, if it dropped quickly the battery was
at the end of its service life.
On 7/15/2022 4:40 PM, Allen Brier via BVARC wrote:
I have a Cyberpower UPS that’s been working great for several years. I
noticed yesterday that when I had a power glitch, it died immediately.
I took it out of line and put it on my bench with no AC input. Power
up and it says it has plenty of capacity, (no AC input) but when I add
a small load to it, it dies completely. I took the batteries out and
they show 12.72 and 13.03 volts respectively. I have no way to load
test the batteries properly.
Any ideas?
Allen R. Brier N5XZ
1515 Windloch Lane
Richmond, TX 77406
713-705-4801
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