Quote Originally Posted by darth_chasm View Post
You'll need to hack the board to work on a single cell. Or you can switch to a Prizim. Make sure to read up on the manuals.
Yeah, PCs are meant to run off of a 7.4V so you have to "hack" them to run off a single cell. It explains how to do this in the PC owners manual. But like darth chasm pointed out, you might consider switching to a PRIZM, which are made to run off of a single 18650. Pretty sure the PRIZM has a 5.5V limit like the NB. The PRIZM is also a bit smaller in size than a PC.