External Li-ion battery pack with up to 10 years service life, For APC Smart-UPS SRT Li-ion SRTL1000RMXLI, SRTL1000RMXLI-NC, SRTL1500RMXLI and SRTL1500RMXLI-NC systems, Can be used as a spare battery or to extend runtime, 48 V DC, 585 Wh, Safe to operate in up to 40 °C environment temperature, Incl. 1 U rack installation kit, Weight: approx. 13 kg Additional runtime: 1350 W load: + 21 min. 1000 W load: + 28 min. 800 W load: + 34 min. 600 W load: + 45 min.