Cells

[nitrost]

What is the difference by the number of cells like 6 or 7

 

[Candyman]

That is merely the number of individual batteries that make up the power supply. 7-cell has 7 batteries. 6-cell has 6. Typically adding more cells increases the voltage of the pack.

 

[Rolex]

Candyman is correct. Each cell is 1.2 volts. Multiply the total of cells by that voltage, to get the voltage going to the motor. More voltage, more RPMs.

 

[GilBeQuick]

More voltage also means more wear on the motor. Be carefully, certain motors can only handle a certain amount of cells. As a general rule, 540 (also called 05 motors, or standard car motors) really should only be run on 7 cells or less. They can be run on 8, but they won't last long at all. On 7 cells they'll wear a lot faster than on 6 and need to be rebuilt more often.

 

[Wardo]

And, 7 cells will get less run time then an equal quality 6 cell pack. Anytime extra voltage is pushed to a motor it will create more heat, heat equals resistance.