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CS500 Powers On Without Battery Or Not?

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.


CS500 Powers On Without Battery Or Not?

This was originally posted on APC forums on 3/10/2018

I just acquired 3 used CS500 units.  Two of them power on with their replace battery light flashing and emitting beeps, either with a bad battery or without one.  But the third one does not.  If I place a bad battery in that unit, the 'On Battery' glows a faint amber, but I cannot turn the unit on or off.  The fuse/reset button design for this unit is different than the other two, having a wider black reset button as opposed to a skinny white reset button.

My question is if this unit is bad, or does it behave differently by design than the other two?  I have a brand new RBC2 battery on the way to get these units back in operation, and will test the battery on this unit in question, but it would be nice to have a clue as to what's going on.

Thank you in advance.