PKCELL PK Cell 9V 6F22 Super Heavy Duty Batteries (100 Pack)

Q: How many mAh are these in a smoke detector?

Beware this battery only lasts about three and a half months in our plain jane smoke detector. Then upon replacing it with a new one the new battery only had 7 volts. I then checked other batteries from the same pack and found another one measuring 7.3 volts. Experation date on bottom of batter is 12/2024. It's past the one month return window and Amazon says its too late. They wouldn't help and told me to contact the seller

Q: Will these batteries leak?

The batteries come new and not working, read the reviews and see so getting to the point of a leak is probably not going to happen because the batteries are useless..