ThinkPad T61/R61 14W 9-Cell High Capacity Battery. Increase you unplugged computing time. This high capacity battery has an extended area on the back edge and fits in the standard ThinkPad T & R Series 14W notebook battery slots. 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.