Good comments about hearing aid batteries but as far as moving government, their major issue is probably economics, not safety. The differential cost of rechargeable batteries and chargers vs single use batteries over a few years is negligible but the former amount (roughly $300) is in up front costs the government would have to subsidise, versus consumables left to the user (roughly $300 over 3 to 5 years).
Not intending for the points to be answered as it would get into a survey of products that would be OT. nb there are two topics about hearing aids, one here and the other here.
It becomes a catch 22 for government for button battery safety against their budgets. My punt is budgets win any time their benefactors are not major recipients of spending policies.
The pluses and minuses of the modern rechargeable hearing aids is best continued in one of the existing topics, linked above.
