External Li-ion battery pack with up to 10 years service life, For APC Smart-UPS SRT Li-Ion SRTL1000RM4UXLI(-NC), SRTL1500RM4UXLI(-NC), SRTL2200RM4UXLI(-NC) and SRTL3000RM4UXLI(-NC) systems, Can be used as a spare battery or to extend runtime, 48 V DC, 50 Ah, Safe to operate in up to 40 °C environment temperature, Incl. 2 U rack installation kit, Weight: Approx. 27 kg Additional runtime: at 2700 W: + approx. 47 min. at 2000 W: + approx. 61 min at 1500 W: + approx. 79 min