The following is a link to a post under another heading.
http://www.rcuniverse.com/showthread...527#post491461

All they are doing is adding a resistor in series for the six volt range. I am not in favor of using the voltwatch by itself without adding more load then what you induce by actuating the servos. You don't need to buy one for every plane all you need is one set up with a resistor (20 OHM for 4.8V pack) that can be switched in when you take a reading. As long as you have your charging jack to the exterior of the pane you can test the battery before every flight. This eliminates the weight and the minor drain of the battery through out the whole flight.

Acee