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Maybe this will help make sense of it all....
NiMh AAA = 1.2 Volt - 600 MA
NiMh AA = 1.2 Volt - 2100 MA
4 x AAA = 4.8 Volt Total
4 x AA = 4.8 Volt Total
The above battery stats are based on NiMh batteries that I have in front of me, and are not the same as NiCad, or even Alkaline Batteries.
Advntages of AA over AAA
You are looking at 3.5 times longer run time over AAA.
The Advantages of AAA over AA
AAA Batteries weigh less than AA Batteries.
AAA Batteries are smaller than AA Batteries.
I am not sure if 4 AA batteries will fit, however it is something to look into. However given the small size of the cars, I doubt that you will be able to fit 4 AA batteries and still be able to put the body on it.
I hope that this helps.
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