cyberpower

Hello, everybody. This is about a CyberPower UPS. Specifications: 600VA/360W, Line-Interactive, LCD, 19"/1U (rack type), USB | OR600ELCDRM1U Bought in: 2017 I replaced its 6V batteries once in 2020. Recently it started beeping regularly. I powered it off and let it be. Some time later, I...