These will power an N64P, yes?

[Noah]

http://www.batteryspace.com/Polymer-Li-Ion-Cell-3.7V-3900-mAh-684698-2C-14.43Wh-7.8A.aspx
I would need 2 of them, and a PCB, correct? I don't have much experience with cells, I used rechargeable packs for my first two portables.

 

[bud]

Yep.

 

[Gyroninja]

Should work