Lenovo thinkpad batteries let you stay unplugged longer the thinkpad x200 series 6 cell lithium ion battery is rechargeable battery that uses lithium ion technology it can be used as a replacement for aging system batteries or as a convenient spare battery features lenovo lithium ion battery for thinkpad x200 series lithium ion li ion technology six cell rechargeable system battery 108 v 52 ah standard system battery specifications over discharge protection one year customer replace