oh yeah my bad haha. The Buck Puck will need at least 5v so will need 2 of those 3.7V batteries giving you a total of 7.4V. It will be taking the place of the resistor you would use for the main LED. With the 4 wire Buck Puck you have a voltage in, a voltage out and a + and a - to the main LED. In the case of the 6 wire Buck Puck the extra two wires can either not be used, or used with some other electronics to adjust brightness. Basically what the Buck Puck is doing is providing a constant regulated current to the LED, where as with a resistor the current being supplied the LED diminishes as the batteries die.
Of course bringing the voltage up to 7.4v you will need the 5v regulator so that you dont fry the econo sound board. So if you're just looking to keep it simple you can go with just the 3.7V battery and one resistor for the main LED and one for the switch LED. Or you can go with the 7.4V setup, use a Buck Puck to give a more constant current to the main LED, and still have the one resistor for the switch LED (This resistors value will change because of the higher voltage to it), and use a 5v regulator to keep the econo sound board safe. And yes the 7.4v setup will give you longer run time between charges, and with the combination of the Buck Puck the blade will stay bright.
There are two different mA rated Buck Pucks in the store, a 700mA and a 1000mA (1Amp). The Rebel LED is rated to run at 700mA. You could overdrive it by using the 1000mA Buck Puck, this would increase brightness, but if ive read correctly it will lower the LED's lifespan for sure and/or possible fry it. Not too sure on the second part, alot of people successfully overdrive their LED's.
Im still pretty new at this myself, aside from some college electical engineering classes and alot of reading haha, but im pretty sure thats all right. If anyone sees anything i messed up please correct me haha. The choice is yours now, i hope that helps clear some things up.
PS. i didnt suggest the 9" body X)
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