Driving ability 4S notorious 6s BLX (V5)

I tested the driving ability with a notorious 4 cell on a BMX track.
The 6-cell is a standard specification, but when you run it with 4 cells, it is still lacking in power.
6 cells must run 6 cells.

Arrma notorious 6s BLX (V5)

Option Parts : ARA320573 Super basher front bumper
Battery : DXF 8400mah 120c 4s