Green modepatent-pending operating mode that bypasses unused electrical components in good power conditions to achieve very high operating efficiency without sacrificing any protection. Battery failure notificationprovides early-warning fault analysis on batteries enabling timely preventive maintenance. Power-saving outletsautomatically cuts power to idle equipment to conserve electricity. Resettable circuit breakereasy recovery from overloads; no need to replace a fuse. Battery-protected and surge-only outletsreserves power capacity and run time for connected equipment that require battery back-up while providing surge only protection for less critical equipment. Cold-start capableprovides temporary battery power when the utility power is out. Hot-swappable batteriesensures clean, uninterrupted power to protected equipment while batteries are being replaced. Disconnected battery notificationwarns when a battery is not available to provide backup power. Dataline surge protectionprovides protection of connected equipment from power surges on the data lines. Automatic self-testperiodic battery self-test ensures early detection of a battery that needs to be replaced. Adjustable voltage-transfer pointsmaximizes useful battery life by widening the input voltage window or tightening the output voltage regulation. Adjustable voltage sensitivityprovides the ability to adapt the ups for optimal performance in specific power environments or generator applications. Audible alarmsprovides notification of changing utility power and ups conditions. User-replaceable batteriesincreases availability by allowing a trained user to perform upgrades and replacements of the batteries reducing mean time to repair (mttr). Usb connectivityprovides management of the ups via a usb port (not available on all models). Serial connectivityprovides management of the ups via a serial port.