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The RB1290X4L UPS Replacement Battery Cartridge restores life to CyberPower UPS systems that have weak or completely depleted internal batteries. The RB1290X4L contains four 12V/9Ah batteries, certified to meet or exceed original manufacturer specifications. This leak-proof, sealed lead-acid battery never requires replacement fluid. The pre-assembled cartridge installs easily into your CyberPower UPS system and is shipped with reusable packaging for delivering expired batteries to a suitable recycling center.