you'd only need 1 set of cells each, as they can be charged between rounds easily. If you want to do regionals then you'll need brca approved cells, but if not then the only restrictions are what the club imposes.
Personally I'd get 1 lipo per vehicle and 1 charger per vehicle. The simple solution is usually the best!
30c will be nice and fast with decent capacity (4000ish), but you can usually tame them on the speedo settings or on the transmitter.
Usually nothing wrong with cells from HK. Alot are the same as over here, but sold under a difeent name.
I'd try and get more capacity than the one's you've listed. A 4000ish pack will do 2 5min races easily with your 10.5 motors, easing the charging burden even more.
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