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I hope it’s not lithium ion. Seems like that would be overkill for a stuffed animal.
Lithium batteries are very compact and competitive price wise. Not overkill in the slightest.
They often get thrown in the garbage instead of being recycled. They can catch fire when punctured. Not something I would want near a small child when a NiMH would do just as well.
NiMH or regular akaline batteries can also catch fire when they get thrown in the trash.
Also they make lithium ion AAs too.
Lithium AA (like Duracell and Energizer) you buy at the drug store aren’t the same as lithium ion rechargeable batteries you find in computers and automobiles.
“When alkaline, NiMH and even lithium AA batteries rupture, the force and heat of the explosion isn’t anywhere near that of, say, an explosive li-ion failure”
https://uk.rs-online.com/web/content/discovery/ideas-and-advice/aa-batteries-guide
Ya, but unless your 3-year-olds other toys included an icepick and a mallet, I think it's safe enough assuming you're also comfortable with them riding in a car on public roads. (Source: I have two boys age 3 and 5 who are not dead yet)