theone Posted March 6, 2022 Share Posted March 6, 2022 Hi, I have an BR550GI Back-UPS pro APC UPS for a few years. Recently I replaced the battery (not the first time) and am having strange issues with the UPS. I charged the battery for several hours to make sure it is full. The issues I am seeing (UPS is connected to PC with PowerChute SW for diagnostics): When connecting to a load (lamp/Computer - tried both) and UPS is connected to AC mains the capacity % goes down in jumps of ~7% over hours (not one percent at a time). When disconnecting the load and UPS is still connected to AC mains the UPS does not charge the battery. % keeps dropping same as previously. What can be the problem? Notes: When powering off the UPS and UPS is connected to AC mains the UPS does charge the battery (% goes up slowly until it reaches 100%) opened the unit and saw no swelling in capacitors Quote Link to comment
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