ok so i got the multi meter and here are my findings
using a fully charged 4.18V 18650
Sigelei
@3v = 1.36v
@4v = 2.52v
@5v = 4.08v
@6v = 6.01v
now for the crazy vamo
@3v = 1.45v
@4v = 2.60v
@5v = 4.15v
@6v = 6.04v
..... ...? just put the protank back in it and now its fine

put the stacked batteries back in it. and its still fine... damn it i really wanted to see those numbers too. thing was hitting like a freight train. if it happens again i will be sure to post the numbers!
i think its safe to say after 10 ish months i think it may be on its way out.