Stay unplugged longer with a spare ThinkPad system battery. Replace your original 4-cell system battery (select models) or carry an extra to stay unplugged longer. The Slim Line battery is designed for use with ThinkPad X60s Series notebooks only. (Note that it is not compatible with other ThinkPad X60 Series models.) Its streamlined shape ensures a flush fit when you connect your notebook to the optional ThinkPad X6 UltraBase. Interested in staying unplugged even longer Consider combining the ThinkPad X60s Series 4 Cell Slim Line Battery with the optional ThinkPad X60 Series Extended Life Battery (40Y7005) for up to 5.7 hours (1) of unplugged time on select models. Or combine it with the ThinkPad Advanced Ultrabay Battery (40Y6789), used inside the ThinkPad X6 UltraBase, for up to 5.2 hours (1) of unplugged computing. (Note that the Extended Life Battery cannot be used in combination with the ThinkPad X6 UltraBase.) (For battery life, go to lenovo.com/alldaycomputing)

• Meets original equipment specifications for proper fit and performance:
  
  - (Note: The ThinkPad X60s Series 4 Cell Slim Line Battery conforms to the exact shape (footprint) of the Thinkpad X60s Series notebook. The ThinkPad X60 Series 4 Cell Enhanced Capacity battery provides longer computing time,  however it is larger and extends to the rear of the notebook.)

• Delivers up to 3.11 hours(1) of battery life

• Designed so ThinkPad X60s Series system fits flush in the ThinkPad X6 UltraBase.

• Warranty by Lenovo with renowned Service and Support available from IBM
  
  Important note: This battery is designed for use with ThinkPad X60s Series notebooks only.  It is not compatible with other ThinkPad X60 Series models.
  
  (1) A description of the testing and the environment under which the test was performed is available at www.lenovo.com/pc/ww/thinkpad/batterylife. Battery life (and recharge times) will vary based on many factors including screen brightness, applications, features, power management, battery conditioning and other customer preferences.