The Voltwatch is an "Expanded Scale Loaded Voltmeter". As others are trying to point out use your servos as the load and the Voltwatch as the expanded scale meter. Learn to watch how low the LED's dip during periods of high current draw, heavy load, and you can predict how much life is left in your battery. If this is not good enough for you, place a voltmeter in the system with the Voltwatchand document the voltage levels for each LED. I have designed and built my own version of a Voltwatch and I can assure they are nothing more than an expanded scale voltmeter.