If you have to split your pack (like pictured) you have to use a bridge wire to connect the cells.
If you don't hardwire, you still have to solder the plug wires on the end of the other cells. (Or else solder a battery bar for a tab to hard wire)
If you are running a chassis that you don't have to split the battery, there is no need for the bridge wire. (Battery on one side of the car...radio gear on the other to balance the weight)
I assume if you are splitting the cells, you are running 1/12th scale?
R/C Racing since 1985 ~ Santa Maria, CA (Central Coast)
2001-2012 - South-West Tour R/C Oval Series - R.I.P.
...will the SWT be revived? Time will tell, but we ARE returning to the VELODROME in 2016