I store my old batteries in a zip lock bag and they end up jumbled around, just like your bottle. Periodically, I take it down to Aldi, where they have a battery recycle bin and just empty it into there. What's inside that bin makes your collection and my collection trivial - yet I know of no issues doing that.
Without the ability to deliver notable current, there's no electrical issue.
Leaking chemistry, however, could become messy. Find yourself a battery recycle/dropoff centre and get rid of them.