These look very good. I'd be interested to find out how biodegradable the non-paper parts are... Has any thought been given to what happens if a kid swallows

These look very good. I'd be interested to find out how biodegradable the non-paper parts are... Has any thought been given to what happens if a kid swallows one of these batteries? I'm wondering if they're better or worse than swallowing a typical tiny cell battery.