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.
Three -cell, rechargeable system battery, 29Wh
Standard system battery specifications
ThinkPad Battery 52 (3 Cell - for X220 Tablet only)