The voltwatch is actually more dependable than a loaded voltmeter if (a big if) you take the readings right after landing befor turning off the receiver and transmitter as you have been using the actual load from flying. If you wait awhile to read it though, the battery will partially recover so might read slightly higher than right after a flight. Not only that, if you cycle the stick while reading the bar graph and you see the lights dancing up and down the scale, you know you have other problems like dirty contacts, stuck servo or high impedance somewhere between the battery and the reciever.