The CyberPower BP36V60ART2U Extended Battery Module (EBM), extends battery runtimes during power outages for select CyberPower UPS systems SMART BATTERY MANAGEMENT: Uses a three-cycle charging mode that improves battery life and reduces generated heat. FAST CHARGE TECHNOLOGY: Expands runtime and quickly restores full backup power 2U RACK/TOWER: This EBM takes 2U of rack space and can be installed in a rack or tower configuration to match the UPS form factor. Up to ten EBMs can be added to the UPS for extended runtimes. COMPATIBLE WITH: OL1000RTXL2U, OL1000RTXL2UN, OL1500RTXL2U, OL1500RTXL2UN 3-YEAR WARRANTY