More than one lead acid battery. A combination of two or more cells electrically connected to work together to produce electric energy, and components of generators and uninterruptible power systems. UPS batteries from Powercontinuity systems for your Riello UPS Power Supplies, Eaton UPS Power Supplies, AEC UPS power supplies and Emerson Leibert UPS power system. All Battery makes supplied. UPS batteries need replacing at least every 3.5 years as a minimum. When was the last time you replaced your UPS Batteries? T 2000 is a well known and robust UPS for which all parts are available from PowerContinuity Systems.