The 9-cell 57++ ThinkPad Replacement Battery from Lenovo enables you to stay unplugged for a longer time with its 100Wh battery energy and 9.21Ah battery capacity. This rechargeable battery uses Lithium-ion technology and can be used as a replacement for aging system batteries or as a convenient spare battery. 9-cell system battery Lithium-ion technology Over-discharge protection prolongs the life of the battery Battery Safeguard chip authenticates the battery's use with Lenovo systems
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