I do it too in my TRF501X, for different reasons:
- it is cheaper
- it is less heavy than 6-cell racing (70gr)
- the power is the same with a faster motor (I use a 4,5 LRP)
- in the 501X, you can balance the car 100% right with 5 cells
- a bit easier for your ESC
It works well for me actually.
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