It's not just a choking hazard, they can do nasty internal damage if swallowed.
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Beware, Tiny Batteries Can Cause Big Injury for Kids
Pediatric surgeon discusses what happens if you swallow a battery. See what to do if your kid swallowed a battery and learn more about button battery ingestion.healthblog.uofmhealth.org
But hey, call kids stupid and such, Apple should have made it a bit more child proof.
Look how easy it is to open, I can't think of many recently made items, powered by a button battery, this easy to open.
I have a remote that seems to take three hands to open. They made it so hard to get the battery out of it, I really hate changing it, but so many devices could meet your definition of 'easy to open'. Back in the day, my sister used to laugh as their kid chewed and sucked on the TV remote. I was completely disgusted, but she's not blood related so *SHRUG* And her daughter also sucked on their car keys, and that almost made me puke. But her daughter grew up, survived, and aside from a facial tic (JUST KIDDING) she seems fine...
(She also had the Barney CDs on repeat for her daughter, and all of her kids. I'm surprised they aren't mass murderers now! Most cringe at Barney, so maybe that's why the show died?)