I had a hard time finding a battery for my sports watch. The battery designation was (IIRC) CR-2430; I’m told that the number means it’s 24mm in diameter, and 3.0mm thick. The replacement battery (Duracell brand) I found is designated DL-2430.
My question is: What does the CR, DL, BR, etc. mean in the battery designation? Are there lots of them?