Replacement battery set for the following devices: APC Smart 2200, 3000 tower UPS (XLi, SUA and SMT models) 2 sets are required for an external battery expansion kit Smart 5000 SUA (tower/rack model) requires 2 sets Battery type: VRLA (lead acid) Battery service life: 3-5 years Storage advice: Avoid extended storage of UPS batteries to prevent deep discharge