Battery Wire Length

[jkonline]

I have a Novak GTB ESC which is fitted with 10cm long battery wires designed to solder directly to the battery cells. I also have a 2 stick packs with a 12cm long wires and tamiya connectors. To get it to work I added added tamiya connector to the esc wires.

It all works however there are two concerns.

a) The combined length now is 22cm which is a lot of wire to house in the car.
b) I have seen online issues over very long battrey leads causing spikes and breaking speed controllers

Are these justified concerns and if I was to shorten the lead which should I cut and add new connectors too and how long is the mex length?

Thanks