Hi! New member here!

I'm trying to build my first robot, but I cannot see any physical way to get the batteries into the circuit with the receiver and servos! The battery section on the receiver has 3 pins, so I need something they fit into (like on the servos) but I do not know what these are called, or how to attach one to my batteries.

Any help? xD
Cheers!

For those wondering:

I have these batteries:
http://www.hobbyking.com/hobbyking/s...Trex_100_.html

This receiver:
http://www.hobbyking.com/hobbyking/s...Receiver_.html

And these servos:
http://www.robotshop.com/uk/9g-conti...RwAaAnCp8P8HAQ