The AT&T 12V 5AH is a Telecom system that requires a 12V 5Ah AGM replacement battery. The compatible Universal Power Group replacement is the UPG UB1250 12V 5AH F1 AGM Battery (UB1250), a 12V 5Ah AGM sealed lead-acid battery. This battery delivers up to 60 watts of standby power. It weighs 3.09 lb, uses F1 terminals, measures 3.54 L x 3.98 H in, and has left polarity. This is a direct drop-in replacement for the AT&T 12V 5AH requiring no modification to the device.
