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Increase your unplugged computing time. This high capacity battery has an extended area on the back edge and fits in the standard ThinkPad T & R Series 14" Wide 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 time) varies based on many factors including screen brightness, applications, features, power management, battery conditioning, and other customer preferences.