I want to start off by saying that the new Traxxas Summit ROCKS!
But I had to change something very simple. Let me first explain . . .
I have two sets of batteries for the Summit, so that I can run one set while charging the second set. It is a royal pain to remove the battery wire through the wire port slot next to the cooling duct on the battery compartment. The Traxxas plug will simply not fit in-and-out through the stock wire port. In order to remove the battery totally from the compartment, you have to completly remove the battery cooling air duct via two little screws and then slide the wire out through the large vent opening. (you will have to do this when installing the batteries for the first time.)
So what I did was take a razor blade, and carefully removed the "vents" from the air duct. I then sanded the cut ends of the plastic with some fine grit sandpaper, so I didnt have to worry about any sharp piece of plastic rubbing into my battery wire from vibrations while I drive.

I figure the batteries can still get plenty of air flow, but at the same time, I can completely remove them from the compartment without having to disassemble the vents to get the wire plug through. Instead of running the wire through the small slot provided, I run it through the larger opening I cut in the vent. It works perfectly!
It’s a simple mod for anyone who has the luxury of two sets of batteries and a dual quick charger. I can run the Summit practically non stop with just enough time to let the engine cool down, without having to worry of it over-heating.
Easy mod, very simple, and something I highly recommend doing.