ORIGINAL: vasek
I have been using 4.8V but since switching to Spektrum I am on 6V now.
When the servos can't take 6V I use a 5 cell combined with a regulator. This way I'm sure my Rx & servos are getting a steady 5.2V.
This is the regulator (BEC) I use:
http://www3.towerhobbies.com/cgi-bin...&I=LXSWL3&P=ML
The 1st thing to do is check the battery voltage right after it's off the charger and see what the voltage is.
All you need to do is insert a voltage dropping diode in 1 line and it should drop appx 1 volt.
However if your just running a trainer with 4 servos and little load I would just stick with the 4.8 volts and go with a higher MaH battery.
Vegas/