- This high quality Li-ion battery pack provides 3900mAh and 11.1 volts of power and is made specifically for the Lenovo ThinkPad T420s and T420si series of portable computers. Meets or exceeds OEM specifications. 6-Cell
- 11.1V. Eqv. 66+
Replace the old or worn out battery in your laptop working with the efficient Total Micro Battery. This 6-cell battery for Lenovo laptops features a capacity of 3900mAh.