MK2kompressor has a nice battery pack tutorial written up on our GSR homepage. It's long, so go find it yourself.
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Went testing again with two changes to the car, an anti-roll bar in front and properly mounted rear tires. I was definitely going faster than yesterday, there was just so much steering and corner speed I almost couldn't help but push the car to see how much more it could give.
Eventually, my rear tires wore out so I started to spin and slide in the high speed sections, so I changed out for some updated tires which gave me too much grip and ruined my sweet setup, lol. I'm going to have to play some more with my suspension to take care of this issue. That and now I need new front tires.