The CyberPower AVRG900U battery replacement kit is shipped fully charged and tested to ensure you the highest quality possible and comes standard with High-Tech Battery Solution's unbeatable two year no-hassle warranty. All sealed lead acid batteries purchased from High-Tech Battery Solutions are designed specifically for the deep-cycle stand by use associated with all CyberPower battery backup systems. Our batteries are of the highest quality on the market and are guaranteed to perform to or surpass OEM specifications.