High online efficiency reduces utlility costs, generates less heat. Patent-pending operating mode that bypasses unused electrical components in good power conditions to achieve very high operating efficiency without sacrificing any protection. Energy meter provides actual kilowatt hours of usage for energy conscious users. Predictive replace battery date dynamically provides the month and year when battery replacement is recommended to aide in long term maintenance planning. Intuitive LCD interface provides clear and accurate information in multiple languages with the ability to configure the UPS locally with easy to use navigation keys. Single outlet group that may be controlled separately from the UPS for discrete reboot of hung devices, sequenced on/off and non-critical load shedding. Pure sine wave output on battery simulates utility power to provide the highest degree of compatibility for active PFC (power factor corrected) servers and sensitive electronics. Cold-start capable provides temporary battery power when the utility power is out. Temperature-compensated battery charging prolongs battery life by regulating the charge voltage according to battery temperature.