Wow. I saw this kinda late but I'm commenting anyway. Others may read it. Good luck on your order.
Basically, the nicostick is a DIY e-power. In other words.... 3.7 volts. They usually have a big button on them since most people don't build a mosfet into them... but they have a 900 mAh battery if you use 14500's. I build them for $8.00. lol.
What I have is called a nicstick, not a nico stick xP I dunno if there's a difference, but I was just pointing it out

. nicstick seems to be a pretty popular brand, even if it isn't one of the best. I liked it, but it's time for an upgrade