Energizer Power Protection offers Uninterruptible Power Supply UPS battery backup systems for office, home and home theater use such as the ER-HM400, ER-HM450, ER-HM500, ER-HM650, ER-HMOF600, ER-HT400, ER-OF800, Office Pro ER-PRO1000 and Office Pro ER-PRO1400 UPS Battery Backup systems. Wholesale Batteries Direct has the high quality batteries that you want to buy at discount prices to keep your Energizer UPS Battery Backup equipment running, in case of power surge or power outage. All of our batteries come with a full 1 year warranty.