The Opti-UPS 1000ES is a UPS system that requires a 12V 12Ah AGM replacement battery. The compatible Universal Power Group replacement is the UPG UB12120 12V 12AH F2 AGM Battery (UB12120), a 12V 12Ah AGM sealed lead-acid battery. This battery delivers up to 144 watts of standby power. It weighs 8.16 lb, uses F2 terminals, measures 6 L x 3.8 H in, and has left polarity. This is a direct drop-in replacement for the Opti-UPS 1000ES requiring no modification to the device.
