Quick tech specs
- lithium ion
- 4000 mAh
- for Lenovo ThinkPad T420s 4170
- 4172
- 4174
- 4176; T420si 4171
- 6-cell
- 43 Wh
- 4171
- 4173
- 4175
Know your gear
Keep notebooks powered with the BTI Notebook Battery. This 6-cell Li-ion battery has a capacity of 4000 mAh for uninterrupted usage. It is compatible with the Lenovo ThinkPad T420s, T420si and more notebook computers.