Stay unplugged longer with ThinkPad Battery 17. This rechargeable battery uses Lithium-Ion (Li-Ion) technology and can be used as a replacement for aging system batteries or as a convenient spare battery. ThinkPad Battery 17 support ThinkPad X100e notebooks.Lithium-Ion (Li-Ion) technology Six-cell, rechargeable system battery, 57Wh, 10.8 V dc, 5.2 Ah Standard system battery specifications Over-discharge protection Supports ThinkPad X100e notebooks