The CyberPower BP48V75ART2U (48V) external battery pack significantly extends run-time during power outages for Smart App Sinewave UPS models PR1000LCDRTXL2Ua, PR1500LCDRTXL2U, PR2200LCDRTXL2U, PR3000LCDRT2U.The BP48V75ART2U external battery pack houses eight (8) 12v 9Ah batteries, connected serially in two (2) strings of four (4) batteries. It is designed to match the appearance of the Smart App Online UPS models and can be similarly mounted in 2U rack or tower configurations. A battery data link transmits the unit's diagnostic vitals to the UPS display for real-time monitoring and a heavy gauge power cord, adapted with plug-n-play DC connectors, permits the battery pack to be easily "hot-swapped", ensuring continuous operation of critical systems, during normal UPS maintenance. Rugged, industrial-grade metal construction - meeting the same standards as the UPS models - allows for installation of the unit in demanding environments. A Three-Year Warranty ensures that this battery pack has passed our highest quality standards in design, assembly, material or workmanship.