At 900W/1000VA this Smart-UPS On-Line Lithium-Ion battery backup system provides high-density, double conversion on-line pure sine wave power. In addition to cleaner, quieter power protection, this UPS is only around half size and weight of comparable UPS systems with similar runtime and has flexible rack and tower installation options. A new extended runtime battery pack provides longer runtime in a small 2U footprint while tripling the life expectancy of the UPS. SRTL 1-3kVA UPSs with this rong runtime battery pack is perfect for applications critical for runtime.