CF battery life?

[Vezan]

Roughly how long would a 7.4V 1600mAh battery pack last with a CF? No accent LEDs or color xtender just a dr/dr/w tri cree and speaker.

[TheUnchosenOne]

40 minutes or so, give or take.

You can calculate this as follows:

((mAh capacity of the battery) / ((mA draw of the LEDs) + (mA draw of the speaker)))

So obviously it depends on how you're powering the LEDs and the wattage of the speaker, since that is wattage/voltage (this will give you in amps, so you'll have to multiply by 1000 to get mA). Assuming you've got a 2w speaker, that'll be about 270mA, and if each dR is run at 1000mA, that total is 2270. So:

1600/2270 * 60 = 42

Minus a little for FoC, which isn't on much but will add another 1000mA to the draw when it is, and is an estimate at best since the precise capacity of a battery depends on lots of factors that you can't really measure while you're swinging it around in a lightsaber.