I got it from zebralight. Like i mentioned in my post though, it is longer than the AW batteries. When i first put it in (nipple side up) it engaged the switch on my ultra so it stared heating just by screwing the top on. I put it in the other way and then you need to move the switch (barely though) to turn it on. After that, and squeezing both ends a little you now need to move the switch(barely) to heat it up either way u put it in. You can barely feel the battery tube slide when you engage the switch but thats just a minor annoyance.Where did you snag this battery?
There is a warning on the battery like i mentioned saying do not use above 60C but i have not had any issues.
The description on zebralights website says its made from a sanyo cell. You can find it by googling zebralight.
Or
I just found a 14500 protected 840mah battery on orbtronic, it also says made from sanyo cell so im assuming its probably the same battery. But im gonna order one anyway just to see if theres any difference in size.
Heres the link for orbtronic
http://www.orbtronic.com/batteries-...on-battery-3.7v-840mah-cell-aa-size-Orbtronic
Edit: whoops seems like orbtronic is out of stock