Looks like it takes one to know one. I've had one 801 battery die because I drowned it. Actually, it was today that it died, and I cut it open to find out what happened to it. The little plastic diaphragm switch was wet and smelt and tasted strongly of cherry eJuice.
My clue should have been that battery becoming harder to draw from over the last few days, but I ascribed that to manufacturing tolerances and luck.
My supplier advocates using and storing the device FLAT. I now wonder if that's a response to the problem of flooded batteries.
I dearly love the amount of vapor my 801s can produce, so to prolong them, I'm draining the cartridges and batteries nightly onto a paper towel and keeping the unit mouth-piece down in my pocket during the day. This has resulted in the odd predicament of needing to point the unit downward in order to get a good vape, but if that's preserving the batteries otherwise, I'm all for it.
Lamar