ORIGINAL: Rodney

It is not the voltage of the pack, it is the voltage at the receiver bus that counts. Even with a perfect battery, if you have sufficient impedance in the leads and switch, the voltage can fall at the receiver bus when a pulse of current is demanded by the servos. This voltage drop, even if it last for only a few microseconds, can cause the receiver to reboot. In short, the quality of the switch and wiring between the battery and the receiver is far more important than the size (MAH capacity) of the battery. You can not measure this with a meter, you need a device that will sense and record this drop when it lasts for only a few microseconds. An oscilloscope works well. The Voltwatch is also a pretty good indicator of this potential problem. If you have one plugged directly into the receiver bus (not at the end of a Y with something else) and you see the red LED flicker as you cycle the sticks, you have a potential problem. The Voltwatch is a much better indicator than a loaded voltmeter for checking out any 2.4GHz system.