Difference is that a gun has no other real function than to kill.
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The sole purpose of a gun is firing a projectile. Period.
I have lots of guns that get used quite alot.
None have ever killed a person.
Most have never killed anything...
except a cardboard target.
In fact, guns dont function at all on their own.
Of course you are correct, we will be able to purchase 18650's, as mainly a mech user I better not be punished for others carelessness but if safe usage requires education, I can see a time when manufacturers of devices will be put under pressure to make them much safer in general, idiotproof specifically because Joe Public just wants to vape instead of smoke, without needing to make any effort to educate themselves in the process.
Pressure from who?
Most gear is manufactured outside the US.
There isnt any legal precendent to redesign products because some users cant spend 5 minutes learning to use them properly.
A warning may be required, but no one will be "pressured" to redesign mods for the uneducated.