The power exstender for the NBv4 says the output for volts is 12 volts. So do you calculate the led resistor for the 12 v output or the 3.7 v of the 18650 battery?
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The power exstender for the NBv4 says the output for volts is 12 volts. So do you calculate the led resistor for the 12 v output or the 3.7 v of the 18650 battery?
3.7 volts. 12 is probably a maximum rating stamped on there. Figure your resistor for your supply.