If your municipality uses a properly maintained landfill, you can just throw them into trash, after sealing them in a regular plastic bag. Such a trivial amount

If your municipality uses a properly maintained landfill, you can just throw them into trash, after sealing them in a regular plastic bag. Such a trivial amount of mercury will not be significant in the big picture of a landfill. For what it's worth, you can also just trash regular alkaline batteries, there's nothing wrong with that either.