i have a question regarding EMG's and the power from the 9 volt battery. it would seem to me that from the minute EMG's were in use they would start to constantly lose the power to amplify the signal or whatever it is that they do ? i really want to pick up a set of emg's for one of my guitars but im kinda worried about the battery life. i checked the emg website and it says they last for a while but for me this is kinda hard to understand WHY they would last for a while ? i know somethings take less power than others..but..to me..power drain is power drain..right ?