I think it may have been the atty... it just popped... even while keeping it pretty wet, lol
im using the ultrafire 14500 protected. have worked fine with everything else. bauway 510s (one did something similar if it was dry), slb 510, joye 510, disposable 510, and a 801.
2 different box mods, one with horn button and led (atty wired before led). One with nothing but wires and a small push-button switch (not a tact). Have worked fine on all other atties.