Radio contact breaks constantly from (comparison Carerra Turnator against Dickie RC X-Ploder)

I bought in July 2013 for my then 7 year old son two remotely operated vehicles, the Carrera Turnator (7.4V 900mAh Li-ion battery) and Dickie RC X-Ploder Ready to Run (7.4 Li-Ion battery 700m Ah). During Turnator after over a year both children and adults are still a lot of fun and he himself with half-empty batteries (2 AA batteries) in the remote control still retains the very least 50 m radio contact and therefore in this radius is fully operational, is weakening the X ploder across the board. It is not suitable at all in my opinion, for there, as ever breaks after a few meters of the radio contact and you then have to ran very close to the vehicle to enable the remote control (9 volt block) again. The batteries of the remote controls currently have different states of charge, so my comparison at the moment not entirely objective fails. But the fact is that the Turnator is always driven as it should go, and the X-Ploder you had always to run after, so that the car in the radius of the remote control remains.

(Downside of Turnators: The body often has contact with the ground, could suffer so he already after a few minutes scuffed looks on rough surfaces such as asphalt or cement and thereby possibly damage (fraying) The vehicle is therefore recommended for outdoor including limited.. .)