Powersonic 12V 7Ah APC Back UPS XS 900 900VA BX900R Battery - 2 Pack Original Power Sonic PS-1270 F1 12V 7AH SLA Battery. Pack of 2 Dimensions: (L) 5.95 x (W) 2.56 x (H) 3.86. Weight: 4.80 lbs. SLA/AGM maintenance free, spill proof battery Rechargeable battery that can be mounted in any position, resists shocks and vibration 1 Year Warranty