So what is happening is the stock battery cannot keep up with the current drawn which leads to a voltage drop. That in turn makes the Taigen board think the battery is dead and shuts off. A stronger battery will help this issue, but buying a new battery and pairing with an older battery is not a great idea. A better idea would just be to purchase a single good battery that can handle the current and would also be both safer to use and maintain. The stock batteries are ok, but I definitely recommend an upgraded one if you plan on off-roading a lot. I would go with at least a 3000mAh, a 5000mAh+ would be even better. We also carry power cables with Deans/T-Plug connectors on them too if you find a different battery with that plug.