2 things about battery packs and batteries:
1. Four standard AA batteries only add up to 4.5 Volts, if you get a 6V battery pack then the car will behave better because it has increased voltage. Also, the packs are usually at least 1000Mah which means that a charge will last longer then a charge of AA batteries.

2. ZIp ties work fine, I use 1 tie for my battery pack. If I need to take it out of the car then I use an exacto knife to lift the zip tie tooth and pull the zip tie apart just enough to get the pack out.

The pack that I have for my RTR rc10gt is one that has the RED BEC connector on it already. I just simply plug it in where the battery case usually goes.

Hope that helps !


chris