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UPS battery losing power and not charging fully for unknown reason?

APC UPS for Home and Office Forum

Schneider Electric support forum for our APC offers including Home Office UPS, Surge Protectors, UTS, software and services and associated products designed to share knowledge, installation, and configuration.


UPS battery losing power and not charging fully for unknown reason?


so i have a Backup-ups 850 BE850G2-UK (Serial: 5B2111T00688) that i bought to replace an older ups in may 2021.

All 4 lights are usually solid, meaning 100% charged, but i noticed a few days ago that the end light was flashing (so charging) and powerchute said it was 84% and charging.

it seems to very slowly increase and yesterday was on 91% but not going higher.

I woke up today and its back down to 84% and charging.


so i'm not sure whats going on - there have been no power events, so no discharge that i am aware of.

Passes a self test.

i only have my pc attached to the back up sockets and i turn that off at night, on during the day.


any ideas?



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Re: UPS battery losing power and not charging fully for unknown reason?

ok, now its 100% charged for the first time in a few days.


is this normal behaviour?

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