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Stay unplugged longer. This high capacity battery has an extended area on the back edge and fits in the standard ThinkPad X40 Series system battery slot. Its compatible design allows it to be in the system when the system is connected to the optional ThinkPad X4 UltraBase Dock. All-day computing is a reality on select systems when you combine the ThinkPad X40 Series 8 Cell Li-Ion Battery with the optional ThinkPad Ultrabay Slim Li Polymer Battery in the ThinkPad X4 UltraBase Dock.