compatible external battery cabinet gxt4 48vbatte gxt4 72vbatte type valve regulated non spillable lead acid quantity x voltage x rating ahr 2 x 4 x 12 v x 90 2 x 6 x 12 v x 90 environmental operatingstorage temperature degc 0deg c to 40degc 32degf to 104degf 15degc to 50degc 5degf to 122degf relative humidity 0 rh to 95 rh non condensing maximum operating altitude up to 3000 m 10 000 ft at 40degc 77degf without derating agency sa