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Posted: 2021-06-2906:44 AM
New battery, 2 months later "Replace Battery" warning
This was originally posted on APC forums on 9/6/2011
I have an old Back-UPS Office 350 that gave me the usual notification about an old battery needing replacement, which I did. Two months later, the UPS suddenly sounded a continuous beep with the Replace Battery lamp lit. Two things strange about this, the first obviously being that the battery is new. The second is that typically with a battery nearing end-of-life, the Replace Battery light will come on, the UPS will give a few short beeps, and then be silent until another reminder several hours later. (I've actually gone a couple weeks before replacing the battery in the past with no interruption in power.) But this time, the light suddenly came on with a continuous beep that could only be stopped by disconnecting the battery.
Naturally I went to the battery shop, and they said it was still under warranty as long as the voltage of the 12 V battery was at least 8 volts. (Don't know what's so special about 8 volts.) Just my luck, the meter showed it at 1 or 2 volts, and the tech claimed it was a faulty UPS that wasn't keeping a charge on the battery.
I came home and recharged the battery to full using a low trickle auto battery charger, popped it back into the UPS which behaved normally with a fully charged battery. But as soon as I removed from the AC wall source with the only load being my monitor, the battery dropped to 10%.
All of this is making me think the battery shop tech is correct, and that the UPS is not charging the battery and in the process ruined it. But I'm not 100% sure of this conclusion and would appreciate a 2nd (or 3rd and 4th) opinion. Is my UPS shot? Any additional information gladly provided.