Item No: Ni-MH Replacement Battery for iRobot ROOMBA 500 Voltage: 14.4V Capacity:3500mAh Max. charging rate:3C Max. discharging rate:10C Dimensions:138*56*46mm Weight:740g Cycle life:300-500 times Price Terms:EXW Payment Terms:T/T, Paypal Packing:Standard export packing