wearable power for 12mm Diffused Digital RGB LED Pixels (Strand of 25)

[bitwiseb]

Hi I would like to make some wearable things with the

12mm Diffused Digital RGB LED Pixels (Strand of 25)

and I have some power questions. You recommend the 5v 2A power supply. So I
would assume
sparkfun's

Polymer Lithium Ion Battery - 2200mAh 7.4v

sku: PRT-10471

would be what I need because 3.7 v will not cut it?
What is the range of voltage the leds take & (and chip)?
I assume because of the chip it has to be a 5v
no more or less. I have looked for a voltage regulator to drop it down to 5
but they dont handel 2A.

Could i also just use a 9v battery with a 2.5 ohm resistor? 5v * 2A = 2.5ohm ? But how long would the battery last?
Or it this the wrong approach and I should find the right voltage regulator?

Thoughts?
Thanks
bitwiseb

[adafruit]

those batteries will kill the LEDs, the voltage cannot be higher than 5V or so.
you can use any of our 3.7/4.2v lithium batteries - they're a little dimmer
see also our LED belt project kit and tutorial for how to use AA's