Stay unplugged longer with ThinkPad Battery 55+ and ThinkPad Battery 55++. These rechargeable batteries use Lithium-Ion (Li-Ion) technology and can be used as replacement for aging system batteries or as a convenient spare battery.

Features & Benefits:
- Lithium-Ion (Li-Ion) technology
- Six-cell, rechargeable system battery, 57Wh
- Standard system battery specifications
- Over-discharge protection