Hi Jim,
Thanks for reaching out to us! The SmokTek 1300mAh eGo battery is not adjustable; however, we do have a number of adjustable batteries. Below, I posted links to the 1300mAh SmokTek Twist Battery and to the Variable Voltage Batteries section.
http://www.smoktek.com/SmokTek-Twist-Variable-Voltage-1300mAh-eGo-Battery_p_853.html
http://www.smoktek.com/VV-eGo-Batteries
Best regards,
Brad