Stumper: 901 Battery LED Resistor?

[nash076]

Okay, kids . . . here's a stumper for you guys:

I've got the remains of a 901 battery. LED is still functioning. I'm going to use the connector in a mod, but I also wanted to keep the blue LED because it's tiny and it'll be perfect to mount in a unit with little effort. Now, here's the question . . .

What size resistor does this LED take? I don't have the specs for this LED; all I know is that it works with a 3.7 volt battery with no trouble. What size resistor do I need to offset it? Does this type even require one?

Help a guy out!

Nash

 

[tinear]

if it's a standard ecig batt round "wafer" LED, i believe the resister is built into the LED chip. just be carefull handling the wires and solder joints, they are pretty delicate.

 

[nash076]

Okay, the resistor is built in . . . what about the capacitor to cause it to fade? What size would it need?