Replacement battery set (consists of 2 battery modules) For Smart RT and SURT 3 bis 20 kVA models and 5-10 kVA SRT models Packaged weight: approx. 38kg . For UPS with 7.5/8/10 kVA and external battery packs, please order 2 sets For UPS with 15/20 kVA and external battery packs, please order 4 sets Battery type: VRLA (lead acid) Battery service life: 3-5 years Storage advice: Avoid extended storage of UPS batteries to prevent deep discharge