I guess this is one of these devices that feels neglected unless you ... with it.
Is the pin translucent plastic in the battery compartment on the wall of the head portion (that the bottle screws into)? If so, yes, so it's a 2nd gen chassis.
We'll see, but my impression is that it's coming from the threaded bottle mating. This is a tricky design to make seep-proof. But (ahem) I sure wish I had a diagram. It sure was bone dry for a while, my guess it's the bottle-mating.
Ok, it's a conspiracy. The bottle had a hairline crack at the bottom of the threading AND there's some other leak. The bottles sure are'nt up to the repeated bending. And the better you seal the juice chamber, the more pressure builds up.
TIPS: for those of us using vertical coil cartos. As the carto ages, the filler gets tougher. That makes pushing juice harder. If you take it out and work a needle down along the wall to where the slit is cut until you see the tip through the slit, you can push the filler towards the center a bit and get back to easier squirshing. If you overfeed the carto it gets empacted and makes less vapor. It's sometimes hard to judge how much liquid is needed. Blowing it out so old liquid comes out the bottom goes a long way to restoring performance. Afterwards you might have to do the needle trick again. A carto I thought was finished turned out to be usable for another coupla days, it was both swamped and empacted. Obviously you can only do that Lazarus so many times, then it's time for a new carto.
Veni, vidi, orderi. GoodProphets.com has a shipment of Boge 2.0 ohm in wrapped black (no leaks) at the
best stateside price: $5.99 for 5, free shipping over $30, tvcfriend coupon 5% off, so that's $1.14 each total. I can't help it ...

;-)
Disclaimer: as far as I know. Not afiliated w/ Boge or GP. Or Vapage.
@Gobbler you wuz right, it was 90% the bottle!