At the Worlds the drivers used 5 cells in the car by fitting an extra connector to the 6 cell packs, rather than building 5 cell specific packs. For example Neil Cragg ran 6 cells with 14 turn motors in qualifying, but changed to 5 cells and 12 turn for the finals. By sticking an extra tube on the battery it saved a lot of messing about reconfiguring everything for 3 races.
Keeping 6 cells in the pack gives you the choice of voltage, keeps the weight the same and makes it easy to fit the battery in the holder made for 6 cells.
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