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The ThinkPad Battery 12 (4-cell) is a rechargeable battery that uses Lithium-Ion technology. It can be used as a replacement for aging system batteries or as a convenient spare battery. This battery is for use with the ThinkPad X200 and ThinkPad X201 Tablet computers.
The ThinkPad Battery 12 (4 cell) is compatible with the ThinkPad External Battery Charger (40Y7625, available separately).