sundance-communications.com/forum Forums Wiring - Telecom Carriers - Trunks & Services Telephone Repairs & Equipment APC UPSs

It's been a year, but I believe the 1400 has 2 12Ahr batteries in series. And keep in mind that the charger will not charge at 10 A rate unless the battery is WWWAAAYYY down. When the terminal voltage gets close to 12 volts, the rate will drop.
I've seen very few APC's with damaged batteries that had batteries under 3 years old. Then it's usually traceable to abuse. (I've seen idiots try to run 2HP hammer drills off APC 650's. Good way to destroy APC, batteries, and the drill)
The APC folks AND the battery folks will BOTH tell you that if you get 3 years out of a battery, you got all you can expect and it will go RAPIDLY downhill from there. John C.

The battery will be WWWWAAAYYY down after a power failure that lasts long enough for the UPS to completely exhaust the battery.

It is a fact, documented repeatedly in the body of literature which encompasses the subject of lead-acid batteries, that a higher charge rate reduces battery life. The optimum charge rate is somewhere around C/10, which for a 7amp hour battery is 700mAH.

A 10-amp charge rate is more suited for something like a group 24 deep cycle marine battery.

The float charge voltage on APC UPSs is also too high, which also contributes to short battery life.