APC BX850M Back-UPS 850 VA 120 V LCD | Compact Tower AVR

Keep essential electronics online when utility power dips, sags, or drops completely with the APC Back-UPS BX850M. Built around an 850 VA / 450 W rating, this compact tower UPS is sized for desktops, routers, modems, and other small systems that still need orderly shutdown protection and short-term runtime. Automatic voltage regulation helps correct common power fluctuations without switching to battery, which preserves battery capacity for actual outages. That matters in offices where brownouts are more common than full blackouts. The LCD display adds quick visibility into status and operating conditions, so users can see what the UPS is doing without digging through software. With four NEMA 5-15R battery-backed outlets, the BX850M gives you enough protected connections for a focused workstation or small network stack without paying for capacity you will not use. It is a practical choice when you want dependable protection, a compact footprint, and the APC name behind the power path. For environments where downtime is expensive but load size is modest, this model offers the right balance of capability and value.