Li-Power Series Lithium Polymer batteries. Feed your power hungry computerized radio a new potent diet of Li-Power! Use our new 11.1V 3000mah pack on your M11 and MX3 transmitters. Use our new 11.1V 2400mah pack on your Z-1 and Helios transmitters. In addition to more power and longer life your radio will instantly shed weight which means more driver comfort! If you re using high power servos in your vehicle then extend you re runtime with our new 7.4V 2400mah flat pack and 7.4V 2100mah hump pack. Not only will you have more reliable run time but the added voltage of LiPO power will give you the fastest response possible from your servos to keep you in control!