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APC Back-UPS CS 500: continuous beep while working from battery

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.


APC Back-UPS CS 500: continuous beep while working from battery

This was originally posted on APC forums on 2/15/2020


APC Back-UPS CS 500

   Model: BK500EI 

   Serial: 4B1051Pl3097

After replacing the supplied battery with an original new battery pack by APC:  

   Model:  APC RBC2

   Serial: 71903L41839

I hear continuous beeps while working from battery even if nothing is connected to the UPS. Battery voltage is always higher than 12.3 V.

Please watch the behaviour on this short video: https://youtu.be/E-zIQTsuGus


Would you be so kind as to suggest me a recovery/repair procedure other than buying a new unit?

Thank you very much.