I’ve worn a hearing aid for over 40 years. The last time I had a battery leak was in the early 70’s during the waning days of silver oxide batteries (dang, them things got EXPENSIVE). I have not once had a battery leak otherwise, and I wear 7 days a week, 18 hours a day.
I’ve tried refrigerating my batteries, didn’t seem to make any difference. Never tried to tape them, research I’ve read said that the batteries, once exposed to oxygen, will continue to degrade, tape or no tape. Interesting to see information up here otherwise.