Keep your Lenovo ThinkPad T420s, T420si, or T430s running smoothly with this compatible 6-cell Li-Ion battery featuring a capacity of 4400 mAh and a voltage of 11.1 V. Designed in classic black, this AC-standard battery is a reliable replacement for the 81+, 42T4847, 45N1037, 45N1038, and 45N1143 models. Perfect for those in need of a new battery for their ThinkPad, this accessory is a must-have for anyone looking to extend the life of their laptop. Upgrade your computing experience with this high-quality battery designed specifically for Lenovo laptops.