Stay unplugged longer with the help of a spare or replacement ThinkPad system battery. Get more the twice the capacity of the 4 cell system battery (select models) or carry an extra to extend your unplugged computing time Its compatible design allows it to be in the system when the system is connected to ThinkPad X200 UltraBase.

Features & Benefits:
-Lithium Ion (Li-Ion) technology
-Nine-cell, rechargeable system battery, 10.8 V, 7.8 Ah
-Standard system battery specifications
-Over-discharge protection