Yea, after I checked out the ones on madvapes, I thought they might be identical. The charge light not changin would be a pain in the ..., but I could tollerate that, if it meant about 5v off one batt. From what I have read so far though, it seems that they only vape at about 4v under load. So I am just not sure. Wondering if these batts and standard res 901's is the way to go for the empire, or stick with low res 901's at 3.7v? Hmmm.... Just cant decide!