CyberPower RB1270X4A Replacement Battery Cartridge - 4 X 12 V / 7 Ah Sealed Lead-Acid Battery, 18MO Warranty

In terms of cost per watt hours, it is an inexpensive choice providing efficient power Provides sufficient power to the UPS with a capacity of 7000 mAh Keeps your UPS up and ready for use at all times Maintenance-free and has low self-discharge Delivers constant 12 V DC to ensure that your UPS is ready to use when needed