The connectors on the battery pack for transmittors are often similar to servo connectors, but they only have two wires instead of three. Depends maybe a bit which radio you choose, not all radios have this option to choose between AA and battery packs.

A charger (yes, it is called charger ) which is listed as 12/230 v means that you can use it both on your car battery while you are out driving or at home in the wall socket.