I also tout the advantages of a Voltwatch. If you could only have one (a loaded VM or a Voltwatch) I'd always take the Voltwatch. Properly used (checking before and AFTER each flight) you can be assured of the capacity for the next flight. The big added advantage of the Voltwatch is that it is almost as good as an oscilloscope in checking for bad wiring between the batttery and receiver as well as giving you a warning if you have any servos going bad and drawing high currents. When you wind both sticks around at full deflection and see those LED's drop down into the red, you can be assured you are running a risk to fly. Any momentary transient shows up warning you of bad contacts or high impedance wiring. A loaded volt meter will not do this. Now, I'm not saying not to use a loaded voltmeter as it give valuable information too, just not nearly as much as a Voltwatch will.