Stay unplugged even longer with thinkpad battery 57 these rechargeable nine cell 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 9 cell system battery battery energy watt hours 100 wh over discharge protection to prolong the life of the battery barcode 887770917130 battery capacity 9200 mah battery capacity volt amp hours 100 wh battery type lithium ion cells 9 colou