Swallowing button batteries is a dumb idea. It can melt your esophagus and stuff. Endoscopy is the way to remove them. But if you have a long delay there are sucralfate protocols. But just don’t swallow them in the first place.

Lyrics

If a button battery is swallowed
please do not delay
The electric charge can melt
the mucosal wall all away
If it’s stuck in the esophagus
and you’ve got a real long wait
You can give some temporizing
enteral sucralfate
But ultimately that kid
needs to get a scope
To remove that caustic battery
you gotta hold on to that hope

[Chorus] Endoscopy!
Button battery!