PowerStar&laquo; RBC21 APC RBC21 Replacement Battery for APC BackUPS BF250 BF280 BF350 PowerStar Brand Batteries 3 Year Warranty When Used In FLOAT DEVICES and 2 YEAR WARRANTY IN ALL OTHER DEVICES Sealed  Maintenance Free Length 5.50 xWidth 1.90 x Height 4.09 ORGINAL POWERSTAR BATTERY