Intelligent and efficient solution for uninterruptible power supply of network systems, selection from entry level to models with scalable autonomy time. Ideal UPS for servers, POS systems, routers, switches, hubs and other devices. Allows temporary battery operation when mains power fails. Indication of usage in kilowatt hours for energy conscious users. Patent-pending operating mode that shuts down unused electrical components when power conditions are good, providing very high operating efficiency without sacrificing safety. Reduces power costs, generates less waste heat. Lithium-ion batteries offer twice the life of a typical lead-acid battery and are small, lightweight and environmentally friendly. Dynamic display of recommended battery replacement date in month and year facilitates long-term maintenance planning. Simulates mains power for the highest possible compatibility with servers and sensitive electronic systems with active power factor correction. Compact design fits comfortably in shallow rack applications. Single output group for separate control via the UPS system for targeted restart of unresponsive systems, sequential startup or shutdown of systems, or shutdown of non-critical loads.