A friend is looking for a camera drone around $100+-. Are there any that use a 2s battery as opposed to a single cell battery? I am concluding that all single cell batteries are worthless. The quads seem to slow down as soon as they begin to discharge. The ideal quad would be 250 or larger with a camera used to take video recordings. It doesn't need to have the camera operated through the transmitter so a camera could be mounted using its own battery.