CyberPower's RB0690X4A UPS replacement battery cartridge restores life to UPS systems with internal batteries that have become weak or completely depleted. The RB0690X4A 6V/9AH (qty - 4) 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. All CyberPower batteries come with an 18-month warranty. Compatible with PR750LCDRM1U and PR1000LCDRM1U UPS.