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 T60/Z60m system battery slot. Its design allows it to remain in the system when the system is connected to the ThinkPad Advanced Dock, Advanced Mini-Dock or Essential Port Replicator. Battery life (and recharge times) depends on many factors including screen brightness, applications, features, power management, battery condition and other customer preferences.