Yes you guys are right on the autos. Some use a pressure switch and some use the equivalent of a tiny microphone to 'listen' for the sound of a drag. I don't know which type Vapor4Life uses, but both can be triggered by putting the condom on as you are creating a tiny eardrum. Every time something pushes on it (whether physically or the pressure of a sound wave hitting it) can trigger.
As to the manuals, I carried mine in the grey XL carrying case, always being careful to keep buttons facing up in the foam inserts... When I didn't do that, I sometimes had dead batts also.
Sent from my phone; Please excuse typos / autocorrections.