NiMh batteries are rated at 1.2 volts per cell (7.2 for a 6 cell pack)
LIPOs are rated at 3.7 volts per cell (most used in RC are considered 2 cell, so they'd be 7.4)
It's been a while since I did voltage testing on a NiMh type pack, but I just got finished testing some of my lipos.
Voltage as I pulled it off the charger
Voltage with ESC turned ON (w/o giving any throttle)
Voltage approx 5 seconds into a run (using a 17.5 Brushless motor)
Voltage at the end of a 5 minute race
mAh's used 1850
average amp draw 22 amps
Data was obtained using the EAGLE TREE MicroPower E-Logger system and a CHASSIS Dyno
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