The Quest External Battery Connector (EBC) is an excellent resource for larger group launches. The Quest EBC allows you to easily use a more powerful 6V 'Alkaline lantern style' battery with your Quest launch controller. Simply attach the Quest EBC onto the 9V connector of your Quest launch controller and connect the other end to a standard 6V 'Alkaline lantern battery' and you're ready for a full day of launching model rockets!
The Quest EBC is also included in the #7700E Model Rocket Launch System
