... ,SGS/RoHS approved UPS user’s manual 48V UPS back up Li-ion battery (4KWH) (Please read the manual carefully before using) Qinhuangdao ... access the connection ports AC IN back of battery, then open the charge switch. At this time, the charge display screen will display ... on characters of this battery, the charging at any time will not injure battery. So, please do charge in time if you can. It ...