Stay unplugged longer with ThinkPad Battery 52 (3 cell) and ThinkPad Battery 52+ (6 cell). These rechargeable batteries use Lithium-Ion (Li-Ion) technology and can be used as replacement for aging system batteries or as a convenient spare battery.
Lithium-Ion (Li-Ion) technology
Six -cell, rechargeable system battery, 66Wh
Standard system battery specifications
ThinkPad Battery 52+ (6 Cell - for X220 tablet only)