recently dropped my beloved new convoy c8 into a cold shallow mud puddle of water (I’m glad there’s no scratch)
the c8 was running warm as I was taking a night walk.
accidentally dropping it into the mud puddle cools the light rapidly but as I got home ready to charge my cells I notice some mud water seeped into the light.
never expected heat cause so much pressure difference in a flashlight tube
well I guess I gotta fix/change one of my bad o-rings but has this problem occurred to anyone?
Heat inside the flashlight tube creates positive pressure. On my S2 triple the button balooned when I ran it insanely hot to test it. Perhaps when cooling fast the pressure equalizes and it suck air or water from the outside.
> when cooling … it suck air or water
This is classic. It’s the same thing that gets water in your gas tank (if you don’t keep it full of gasoline at all times).
At night time everything cools off; the air in the tank contracts and outside air, which contains some moisture, enters and the moisture condenses into droplets.
Next day, everything warms up, and the warmer air pushes back out of the tank leaving the condensed water behind at the bottom of the tank.
Game cameras are plagued with the same problem, left out for weeks at a time in the woods, and water condenses inside them.
Edit: its not Gay-Lussac, its Charles (volume+ temperature)
so I’m guessing even when watertight, air still gets in~
okay ._.
apparently it isn’t water tight w/ a pressure differential
fixed volume of air
apply heat, pressure builds
If some of that pressure can leak out (thru bad o-rings or whatever) and equalize w/ the outside pressure when you rapidly cool the pressure inside drops to below that of the outside air, pressure drops and now the outside air bleeds in to equalize the internal pressure bringing moisture with it.
Sorry but lights are water resistant…not water proof unless they are rated at dive pressures IPX8 ratings
Unfortunately the pressure differential from hot to cold might have exceeded the 1m depth water resistance rating for IPX7
Were you able to clean it up afterwards? Does it still work?
yea fortunately it still works because I noticed it immediately.
most of the water gets in the tailcap side (not the rubber boot)
maybe I expected too much from convoy. I mean these thick orings that comes with my c8 are so grippy it feels convincing.
Edit: The o ring broke at the tailcap. I guess I found my answer to the leakage. :_(
oh well. local hardware shops didn’t sell the size I needed.