I recently installed a new battery in my old XS800. I get blinking red lights on the front, both the overload and the replace battery lights come on. I am not getting any beeping. The overload button does not pop up. Pushing and holding the button in the front turns off the lights for a few seconds. Then they come back on. This happens regardless of it being pulled in or not.
Try resetting the unit.
To do this, follow the below procedure;
1: Disconnect any attached load.
2: Unplug the UPS from the wall socket.
3: Disconnect the UPS' internal battery.
4: Push and hold the "On" button on the UPS for 5 seconds
5: Reconnect internal battery.
6: Plug UPS in to known good power source.
7: Turn UPS on.
Tried that, didn't work. Lights still flashing.
The combination of flashing lights you've described would indicate an internal failure of the unit. If it were capable of being reset, the procedure Bill had described previously should have remedied that. I would suggest contacting your local APC Support for additional options.
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