Battery string with 4 internal battery modules 9 Ah For installation in APC Easy UPS 3S/3M and battery cabinet E3SXR6 Battery service life: 5-7 years . Runtime extension: At 10 kW: + 10.5 mins At 15 kW: + 6 mins At 20 kW: + 10 mins (min. 2 sets required) At 30 kW: + 6 mins (min. 2 sets required) At 40 kW: + 7 mins (min. 3 sets required) . Net weight: 4 x 27 kg . Storage advice: Avoid extended storage of UPS batteries to prevent deep discharge