CyberPower RB1290X6A Replacement Battery Cartridge - 6 X 12 V / 9 Ah Sealed Lead-Acid Battery, 18MO Warranty

In terms of cost per watt hours, it is an inexpensive choice providing efficient power Delivers a long lasting charge with the capacity of 9000 mAh Helps you ensure continuous operation of critical systems Easily replaceable by the user 12 V DC battery can be used as a convenient spare, giving you peace of mind