Extended Battery for LENOVO Thinkpad T420s 4171-A13,ASM 42T4846, 42T4845, 0A36287, FRU 42T4847*11.10V,3600mAh,Li-ion Battery Type: Lithium-ion (Li-ion)  Color: Black Voltage: 11.10V | Capacity: 3600mAh Rate: 40.00 Wh | No. of Cell : 6 | Weight: 287.00 g Compatible Part Numbers: 0A36287, 42T4844, 42T4845, ASM 42T4846, FRU 42T4847 Condition: New, 1 year warranty! Please ensure the product(s) that you are going to buy fits the brand, model, part number and dimension of your device.