This IBM THINKPAD 600E BATTERY have a capacity of 4400mAh,4000mAh,3600mAh and are rated at 11.1V (Compatible with 10.80V),10.8V (Compatible with 11.10V)],10.8V (Compatible with 11.10V). Please make your selection as to your required capacity type.the higher capacity battery IBM THINKPAD 600E[4400mAh] battery are suitable for higher capacity and bigger current applications.But if you needn't so High capacity battery you can buy IBM THINKPAD 600E[3600mAh] battery,this is low capacity but low price, buy this battery can save your money!Therefore a higher capacity battery is not always the best choice. when they satisfy the requirement,you may wish to consider buying the low price ibm laptop battery. popular IBM Thinkpad 600E Battery--supply high quality and cheap price IBM Thinkpad 600E Battery.All IBM thinkpad 600E Laptop Batteries are guaranteed to meet or exceed OEM (original) specifications backed by full 1 year warranty guarantee. Detail url: http://www.ibm-laptop-batteries.net/thinkpad-600e.htm Join discussion...