Lenovo ThinkPad Battery 61 - For Notebook - Battery Rechargeable - Proprietary Battery Size - 2100 mAh - 11.6 V DC

Lithium Ion (Li-Ion) battery chemistry delivers energy to the notebook through an easily controlled reaction 11.6 V DC battery - Ensures a steady and uninterrupted supply to your notebook Proprietary Battery Size battery - Ideal for replacing the older notebook battery easily More environment-friendly as compared to the disposable ones