Smart battery, Hard plastic casing, 12 contacts on end. Comaptible Toshiba Part TS-1800L . Compatible Toshiba Part : PA3107U-1BRS, PA3107U, TS-1800L , PA2487, PA2487U, PA2487UR, P000309660, XM2011P02, P000324210, PA2439UR, PA2487URG, PA2487URN, PA2487URP. Compatible Toshiba Models: Toshiba Satellite : 200, 300, 400, 1400, 1500, 1800, 2000, 2100, 2200, 2500, 2700, 4000, Toshiba Satellite Pro: 400, 4000, 4200, 4300. Product Specifications: Rating: 10.8V Capacity: 4500 mAh Color: Black Technology: Lithium-Ion Condition: Brand New In Stock: Yes