The 6-cell ThinkPad 81+ battery is compatible with T420s and T430s systems. These rechargeable batteries use Lithium-Ion and Lithium-Polymer technology to allow you to stay unplugged for longer. The battery lasts for 44 watt hours on average* and can be recharged with the ThinkPad External Battery Charger (40Y7625).
* The life of the battery differs due to many factors. These include: battery conditioning, power management, screen brightness, applications, features and other customer preferences.• Lithium-Polymer (Li-Polymer) technology
• 6 cell system battery
• Battery energy (Watt-hours): 44 Wh
• Compatible with the ThinkPad External Battery Charger (40Y7625)
ThinkPad Battery 81+ (6 Cell) Compatible with T430s, T420s