Stay unplugged longer with ThinkPad batteries. Provide up to one-third more capacity than the standard system battery. This high capacity battery has an extended area on the back edge and fits in the standard ThinkPad system battery slot. Its compatible design allows it to be in the system when the system is connected to the ThinkPad Advanced Dock, Advanced Mini-Dock, and Essential Port Replicator. Battery life (and recharge times) varies based on many factors including screen brightness, applications, features, power management, battery conditioning, and other customer preferences.
Lenovo ThinkPad Notebooks: