ThinkPad X40 Series 8-Cell Li-Ion Battery
Features & Benefits:
• Twice the capacity of the 4-Cell system battery and up to 7.5 hours of battery life allows users to stay unplugged longer
• Designed so that a ThinkPad X40 Series system can fit the ThinkPad X4 UltraBase Dock with the battery connected
• Recharges in 4.3 to 12 hours, depending on the ThinkPad system usage
• Over-discharge protection.
Lenovo ThinkPad X40 Series 8-Cell Li-Ion Battery. Battery technology: Lithium-Ion (Li-Ion), Battery voltage: 14.4 V, Battery life (max): 7.5 h. Weight: 14.1 oz (400 g). Dimensions (WxDxH): 10.5 x 2.87 x 0.512" (267 x 73 x 13 mm)