Batterytec&reg; Laptop Battery for LENOVO ThinkPad T420s T420si T430s Series, 0A36287 42T4844 42T4845 42T4846 42T4847 45N1036 45N1037 81+. [11.1V 4400mAh, 12 Months Warranty] Battery Type: Li-ion, Cells: 6-cell,Capacity: 4400mAh; Voltage: 11.1V. 100% New Manufacturer. To 500 charging cycles during the lifetime of the battery. CE-/FCC-/RoHS-Certified for safety. 24 x 7 email support, 12 months warranty without problems. Class A cells provide fast loads and low power consumption, chip protection offers both security and stability.