The APC Back-UPS ES350T is a UPS system that requires a 12V 3.4Ah AGM replacement battery. The compatible Universal Power Group replacement is the UPG UB1234 12V 3.4AH F1 AGM Battery (UB1234), a 12V 3.4Ah AGM sealed lead-acid battery. This battery delivers up to 40.8 watts of standby power. It weighs 3.02 lb, uses F1 terminals, measures 5.3 L x 2.42 H in, and has left polarity. This is a direct drop-in replacement for the APC Back-UPS ES350T requiring no modification to the device.
