wire gauge on turnigy lipo batteries

[rcs2022]

Am on to a new RC custom project, and purchased 4 of these lipo batteries;

http://www.hobbyking.com/hobbyking/s...dProduct=21945

My thinking is that the 8400mah and 40C rating would give a good 336 Amps! although not all needed but good to have spare, and give a decent runtime. The reason being most of my turnigy 5000mah 3S 50C are swelling, and some hold only half charge.

Anyway just received them and to my surprise the wires on the lipos are 12awg! the other ones had 8awg! Should I be worried, or just run them. Or would it be recommended to open the pack and weld 8awg wires on them, little concerned about the welding tough.

Any opinions would be helpful; my setup is a 1717 castle motor on XL2 ESC. so it will be pulling some juice.