I have a APC Back-UPS Pro 280 thats about 4-5 years old. When its on, the only light that is on is the green one, meaning that its functioning ok. If I pull the plug or the power goes off, it goes dead immediately that second. The battery light never comes on telling me that the battery needs to be replaced. It connects via serial port to my PC and in Windows XP there is a built in power supply data area for UPS. When I cut off power to the UPS, and plug it back in, Windows XP lists the battery supply as 0% and slowly starts building up. It will eventually build up to 100% after a few hours.. pull the plug or the power goes off, and the power supply goes off immediately and the battery status is listed at 0% when i plug it back in. You get the picture.
Ok based on all that, Should i assume the battery is dead (its provided 5 years of great service *tear*) and I should replace it even though the battery status/warning light never comes on.. Just wonder if anyone has any similiar experience or knows for sure before I pay to ship this 20lb battery back to APC.