Question about voltage USB and 3V3

hello guys!
i am having a trouble with voltage with my spark core.
i power on with usb and the LED’s turn on with full brightness!
i power with 3v and they wont blink with full power.
(I am trying to do the wifi sword tutorial http://blog.spark.io/2014/12/17/warsting-a-wifi-scanning-sword-for-hobbits/)

OH, if anyone from Spark see Zach Suppala, say that the hack is NOT “pretty straightforward”. :’(

Hi @zenbra

You don’t say what kind of 3.3 V supply you are using with your War Sting. Are you sure you are providing enough current? The tutorial says to use these for full brightness:

@zach is very busy but is around here from time to time, but I bet if you try with higher current batteries it work a whole lot better!

the trick, like @bko suggested, is to use higher voltage batteries. Those energizers that he linked to are exactly what we used in our demos; it won’t work correctly with standard AAs.

Thanks guys!
i am from brazil, so i will search a equivalent battery!
thanks!