Powerextra Upgraded 4500mAh 14.4v Lithium-ion Replacement Battery for iRobot Roomba 500, 600, 700, 800 900 Series Roomba Battery Battery Type:Li-ion / Voltage:14.4V / Capacity:4500mAh (Note:this battery only compatible with the Lithium battery charger, not compatible with the Ni-CD or Ni-Mh battery charger) High quality, high capacity battery for longer running time.convenient to use. Brand New Replacement Product, Works as Genuine Parts.Easy to charge and connect APS battery compatible with all Roomba FloorVac models The battery cannot be designed to be 100% compatible with all Roomba models since Roomba series include a large number of models. Through strict testing,we found these models are incompatible:510,530,531,550,560,561,585,650,770,870,880 Safeguard features against incorrect voltage, short circuit, internal overheating.