You need enough so you can charge them up between rounds - I always charge up before a meeting and if it's just me racing (not vicky also) then I generally have enough to do all day without charging.
Ideally you'd need 3 packs of nimh cells so you can charge one up whilst racing with one and letting the one you've just raced with cool down.. if that makes sense.
I assume we can race with LiPo at batley club meetings - and with lipo you can probably get away with 1 pack since you can race & put them on charge quickly before going out to marshall (run!)
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