First MHS build, a few questions...

[Data]

From what I can see on the store side it looks like both the switch and the accent LED are rated at 20mA. I was confused by that at first because it's different from the 18mA supplied by the PC, but I guess it makes sense that your LED would be rated slightly higher than the supplied current. I assume that's what I'm seeing there.

So according to the formula in the PC manual, the accent LED would look like this:
(3.3v - 2v) / 0.018 = 72ohms

In the example they step down from 170ohm to a 150ohm resistor. Will it matter if I step up to an 82ohm resistor for this LED? That's the closest one I can find in the shop.

It's a little weird for the switch. It's this one, by the way. The description says it runs at 3.3v forward which is the same as the supply from the PC. Can't divide zero so the formula doesn't work. It does say:

4.8V would use a 82ohm 1/4 watt resistor, 6V would use a 150ohm 1/4 watt resistor.

But I'm coming off the PC so those voltages don't apply. Do I need a resistor in this case?

Hopefully you can see where I'm getting mixed up.

[Silver Serpent]

The 82 ohm is acceptable for the accent LED.

For the switch LED, just put a small 1 ohm resistor in line. It'll save you from potential overheating issues.

Edit: About Li-po batteries, there was a rather "lively" discussion on FX-Sabers a while back. Safety and durability were brought up. While the thread did get a touch ugly, it does contain useful information if you want to go down the li-po route. http://www.fx-sabers.com/forum/index.php?topic=34628.0

Feel free to read and make your own informed decision.

[Data]

Thanks for the link and the quick answers.