ORIGINAL: BarracudaHockey
ORIGINAL: cvause
Always use a 6v or higer battery for Spektrum. You risk brownout with a 4.8V
That wont happen if you use a battery capacity that is appropriate for the installation and check the battery before each flight with a loaded volt meter. I personally wouldn't bother with a voltwatch.
Bingo! The browouts stem from current drain in excess of what the battery is designed to handle (which temporarily depresses the voltage), not from 4.8V batteries in general.
The gentleman that helped you at the hobby store is mistaken. Receivers can handle a 6V battery, but as mentioned, some servos have trouble with a fully charged five cell battery. If this happens, you can always use a regulator. Keep in mind that a five cell battery of the same capacity will not last as long as the four cell but will give your servos more speed and torque.