What's the best way to get these back in the case? 
The background of the photo looks harsh, dirty, and unfriendly.
Those batteries are suffering from Lithium Loneliness - carry them against your skin until they feel loved and accepted again, and their stress levels abate.
If you have a fediverse account, you can quote this note from your own instance. Search https://mastodon.au/users/isol/statuses/115583828879643087 on your instance and quote it. (Note that quoting is not supported in Mastodon.)