The E2200 is a 2200mAh battery packed in a short envelope.
The EVOD650 is a 650mAh pen battery with 5 click on/off flush mount button.
The EVOD 1100T is a 1100mAh twist pen battery is a variable voltage twist style with 5 click on/off flush mounted button.
The EVOD 650-T is a 650mAh twist pen battery is a variable voltage twist style with 5 click on/off flush mounted button.
The EVOD900 eGo-T is a 900mAh pen battery with 5 click on/off flush mount button.