Power units made up of lead acid batteries to provide emergency back up power protection. UPS battery replacements are common and need to be checked as part of UPS maintenance regardless of the brand of UPS or Battery manufacturer. Yuasa batteries. Fiamm batteries. Both are genuine battery manufacturers. Many others badge batteries from these manufacturers as well as other Chinese battery Manufacturers of which there are today thousands. Electrical power stored in batteries is called Autonomy when referring to the length of time available on Battery Stored Power.