Getting away with one pack is probably ok for the larger meetings where there are more heats and therefore time to charge between runs. I'm probably just going to go for one to start with, but I have some decent nimh packs I can use at club meetings if time is limited. As your starting from scatch may be best to go for two.
Charger is your choice, but you won't need anything that charges at more than 5 amps, which most should do.
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