I used the larger 4800s for the extra run time, but The 3200s will fit under the rear deck and be lighter (IMHO a good race option). Just use narrower battery posts (or file a 'flat' but this will weaken them) or only use longer screws up to the battery plate.
I found cutting away the battery shrink rap, in the area next to the posts helps. It is tight but the 4800s & 3200 will fit.
Plus I used velcro under the battery plate to hold the battery. So far I have not had any problems. The run time is great. There are lighter then cells, cheaper and easy to look after - Lipos is the way forward.
You many find the terminals are very close to the top deck, and being carbon will conduct if they touch the terminals.
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