What happnes if vape pen gets dropped in water?

If you drop a vape pen (or any electronic vaping device) into water, several things happen immediately and over time. Here's a clear breakdown of the risks and what you should do.

Immediate dangers (do not test these)

Battery short circuit – Most vape pens contain a lithium-ion battery. Water creates a bridge between the positive and negative terminals, causing a short circuit. This can happen instantly, even if you grab it quickly.

Fire or explosion risk – A shorted lithium battery can overheat, vent hot gas, or burst into flames. This is rare with small vape pen batteries but possible, especially if you try to turn it on while wet.

Electric shock – Low voltage (3.7V typical) won't shock you badly, but if the device has a USB port or exposed contacts, water can cause unpredictable current flow.

What happens to the device itself

Component	Effect of water
Battery	Internal corrosion starts within minutes. Even if it seems to work after drying, long-term safety is compromised.
Circuit board	Short circuits, fried chips, loss of variable voltage control.
Heating coil/chamber	If oil or flower was inside, water mixes in, making it unusable and potentially growing bacteria.
Cartridge (oil)	Water can seep in through the mouthpiece or air holes, diluting the oil and potentially causing it to leak or clog. Contaminated oil should not be vaped.
USB port	Corrodes quickly, may never charge again.

What to do if it happens

Step 1 – Do NOT press the fire button or insert a charger. Doing so while wet guarantees a short circuit.

Step 2 – Remove the cartridge (if possible). Unscrew the tank/cartridge from the battery. This isolates the battery.

Step 3 – Do NOT shake or blow into it. That pushes water deeper.

Step 4 – Dry the exterior with a towel. For the battery, tap it gently against a towel to remove visible water.

Step 5 – Rice is a myth. It does not effectively dry electronics. Instead:

Place the battery in front of a fan for 24–48 hours.

Or put it in a container with silica gel desiccant (those "do not eat" packets).

Do not use a hair dryer – heat damages batteries.

Step 6 – After 48 hours:

Inspect for any corrosion (green/white residue on contacts).

If it looks clean, try a very short press away from your face. If it sparks, gets hot, or doesn't respond, dispose of it properly.

Realistically, is it safe to keep using?

No. Even if it works initially, water damage leads to:

Unreliable performance (auto-firing, not turning off).

Hidden corrosion that increases resistance, overheating the battery.

Future failure – it might work for a week then catch fire while charging.

Best practice: Replace the battery device. If it was a cheap disposable pen, just throw it away (properly – at a battery recycling drop-off, not regular trash). The cartridge is likely contaminated; discard it as well.

What about salt water (ocean, pool)?

Worse. Salt water is highly conductive and corrosive. Any salt water immersion means the device is immediately unsafe and unrecoverable. Do not even attempt to dry it – dispose of it safely.

Summary

Situation	Verdict
Dropped in fresh water for <1 second, removed instantly, fully dried for 2+ days	Low but non-zero risk – replace when possible
Submerged for several seconds or longer	Discard the battery device
Salt water, soapy water, or any liquid other than clean fresh water	Discard immediately
You see corrosion, swelling, or weird behavior	Discard immediately

Bottom line: Water and lithium batteries don't mix. When in doubt, throw it out (at a battery recycling center). A $30 vape pen is not worth the risk of a house fire or facial injury.