Just read the ABC article about button batteries ingested by toddlers:
https://www.abc.net.au/news/2021-02-15/button-batteries-landmines-in-the-loungeroom/13041928?nw=0
The doctor conducted an experiment with a battery inside a sausage. The sausage began bubbling within minutes and this indicates to me that it is caused by electric current flowing in the acidic environment - well before the battery case corrodes.
Electric current and magnetic fields are inseparable, so there will be a magnetic field associated with the ingested battery. This should be detectable with a suitable magnetometer waved across the chest/digestive tract. Of course, your stud finder/wire finder would probably work too - or a metal detector.
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