Back-UPS 1100VA

[zlatiborac_apc]

I bought this device 4-5 years ago and it served me very well. Somewhere in spring this year I've noticed that it sometimes gave an beep and shut itself. Given that is almost at the end of the battery life I've suspected they are the reason of this behaviour.

Skip to the mid summer. I was on a trip for 5-6 days in which UPS was left disconnected from the power line. When I come back from the trip I've tried to power it on, but all I got was a long beep. I've tried to get spare batteries from my local tech dealer who sells APC devices but he hadn't have them at that moment, and said he was going to order them. And finally few days ago they've contacted me that the batteries have arrived (they are completely identical to old ones, same manufacturer, same type..)

I've opened the UPS, removed old batteries. I must say that I did measured voltage (6V and 7V; but, they were offline for more then 2 months). Also, one of them had a crack on casing and it seams that battery inside the case had swollen). Inserted new ones, connected them in the same way old ones were connected, closed the case, tried to power on UPS, but... All I could get was a clink sound and after that continuous beep. No fan start at this time. I've tried couple more times to start it, sometimes it just clinks, sometimes continuous beep, and only twice did I get a green light, fan started for 2-3 seconds and it shuts down with same beep.

I've again opened the UPS case, got new batteries out, measured their voltage (both same, 13V). Battery case says 13.5V so I used my charger for the car battery, just to get the voltage to 13.5V (just to be sure batteries are fine and not the reason behind the problem), and while they were charging I connected the power to the UPS and measured the voltage on wires that connects to the batteries inside UPS. Reading was only 2V. I don't have schematics but that looks a bit small for me.

Is there anything more I can do or is it hammer time and dunk to the trash time? Only regret is that I've paid a lot for new batteries.

[BillP]

Hi Vladimir,

The battery charger reading 2VDC means its defective. It should be reading +/-13V. Sorry to say but time to replace the UPS.

[zlatiborac_apc · Accepted solution]

Thought so. It is now at the electronic repair shop, will see what they say. Thanks.