Hi

I have a Kyosho Multi Starter Box Pro 2.0 (KYO36209) and I've just purchased a Lipo Battery which is a Turnigy 5000mAh 4S1P 14.8v 20C.
My concern is when I connect the wires which also look visually thinner than the Lipo wires seem to get warm maybe hot as I did not test long enough to find out, also another thing I noticed were small sparks coming from motor and one of the connections. My worry is is this normal or should I use precautions?

Thanks and I have added a picture with arrows, red arrows indicate which wire's go warm and yellow arrow's indicate where spark's are coming from.