Today, a friend of mine dropped his phone in the lake.
After retrieving it, the phone was dead, and now he’s trying to revive it by drying it out.
Fingers crossed 
Without taking out the battery you’re basically creating a fire…
Fingers crossed that you can see this and remove it asap.
Why not?
But wait… what filament did you say it’s drying again? 
This would probably work, but I wouldn’t go above 40°. Lipo’s can degrade or get damaged much above that. And damaged lipos can catch fire.
It depends on the temperature he’s using. I’ve dried a lot of electronics in my dryers before—low temperature over an extended period is generally safe.
I even heat phones to around 60 °C to soften the glue for disassembly and repairs. I haven’t had any incidents so far, but caution is always important.
Safety first.
Heating like that is safe because it doesn’t take long to soften the glue on the heatbed, but he’s cooking it in the AMS for… I don’t know how long…
Most phone batteries are rated up to 45C. And the phone here is already dead meaning a build up of conductive stuff or corrosion has already been there. Which makes the spicy pillow even more spicy.
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LiPo batteries can certainly pose a fire hazard, but modern mobile batteries are no longer open-cell and are therefore not as sensitive as they used to be.
That said, I’ve had a few RC models catch fire mid-air after abusing the batteries or continuing to use them after crashes. 
So always handle LiPo batteries with great care.
Better mid-air than in the house
You’re better off leaving the phone over a day or two in a container full of silica beads
How no one suggested rice yet? Or printing an overenginneered centrifugal drier?