APC RBC7 Smart-UPS SMT SMT1500 UPS 12V 18Ah Battery Real 18 Amp Gel Deep Cycle AGM/SLA Designed for UPS-12180- Nut & Bolt L1-2 Pack Beiter DC Power RBC7 Consists of 2 Batteries Voltage: 12V (12 Volts) Capacity: 18Ah Guaranteed Compatibility with OEM battery Battery Life 3-5 Years Under Normal Conditions