This kit is comprised of high-rate discharge batteries specifically designed for use in UPS back-up systems. These are not general purpose 12V 5AH batteries sold by most battery retailers, this kit is comprised of 12V 12AH AGM series SLAs that are tested using Midtronics equipment in order to guarantee that OEM specifications are met and surpassed. The CyberPower battery replacement kit is fully charged and tested prior to shipment to ensure you the highest quality possible, and comes standard with High-Tech Battery Solution's unbeatable two year no-hassle warranty. All HR sealed lead acid batteries purchased from High-Tech Battery Solutions are designed specifically for the deep-cycle stand by use associated with all battery backup systems.