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CyberPower's RB1290X3L UPS replacement battery cartridge restores life to UPS systems with internal batteries that have become weak or completely depleted. The RB1290X3L 12V/9AH batteries are certified to meet or exceed original manufacturer specifications. All replacement cartridges come with leak proof sealed lead acid batteries that are pre-assembled for easy installation into your CyberPower UPS system. Each CyberPower replacement battery cartridge ships with reusable packaging that can be used for delivery of expired batteries to a suitable recycling center. Compatible with OL1000RTXL2U, OL1500RTXL2U, and BP36V60ART2U.