The CyberPower BP144VL2U01 rack/tower convertible Extended Battery Module (EBM) extends battery runtimes during power outages and is designed for CyberPower UPS systems OL5KRTHD and OL6KRTHD. The BP144VL2U01 takes 2U of rack space and can be installed in a rack or tower configuration to match the UPS form factor. Battery equalization technology improves battery life, and toolless front panel removal makes battery replacement easier. This unit comes with a three-year warranty.