I believe the Cougar is expected this month and if you are a fan, then hold out for one.
You can get two runs out of a sensible sized capacity LiPo, so two packs makes life easy although you could always start with one to reduce costs.
In my opinion, anyone investing in a charger should buy a LiPo/LiFe compatible unit for flexibility and making it more future proof.
Depending upon the manufacturer, a 6.5 or 7.5 is ideal. Perfromance from the motor will also depend upon the spec of the LiPos you have.
Hope this helps
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