I find that certain batteries demand certain wires. If the battery has a high draw then one must use a larger wire. When I run a 4x4 sct 2s that draws a lot of juice, then I use a 10 gauge wire to the esc. On 3 and 4 s systems I also use a 10 gauge wire to the esc. Because a motor uses 3 wires from the esc, the load is much easier, and 12 gauge usually suffices.