Lenovo part: Lenovo ThinkPad Battery(9 Cell-X220)

Overview:
* Lithium-Ion (Li-Ion) technology * Six-cell, rechargeable system battery, 44Wh * Standard system battery specifications * Over-discharge protection For more information on batteries.
| Model name | 0A36287 |
|---|---|
| Description | ThinkPad Battery 29++ (9 Cell - X220) |
| Power management | 4.0 Amp/Hr |
| Battery type(s) | 6 Cell Prismatic |
| Battery Voltage | 11.1 V |
| Note | Stay unplugged longer with the ThinkPad Battery 66+ (6 cell). This rechargeable battery uses Lithium-Ion (Li-Ion) technology and can be used as replacement for aging system batteries or as a convenient spare battery. |