Hi Quick, I have I have tried 2 batteries,the blue trustfire,and the red,blk,and gold trustfire.Both read 4.2+ volts on my meter and both are working good in my box mods. Just for the hell of it, I put 2 spiderfire 3.7 unprotected batts in to see what I got and it read 7.4v at the posts.
Your...