Charlie99
Contributor
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And whatever screwdrivers you need to change them. I have a couple jewelers screwdrivers in my save-a-dive kit and have loaned them out a few times to divers that had spare batteries but no way to remove the small phillips screws holding in the battery compartment.mike_s:extra batteries for dive comptuers (covered above in batteries for electronics).
As mentioned, tie wraps are good items. Some small 4" ones and some larger ones are nice to have in addition to the 7" or 8" ones for mouthpiece replacement.
I keep my save-a-dive kit in an old plastic peanut butter jar, including a tiny 2AAA UK light that I often use as my backup on night dives, after I pass my other backup light off to a buddy that didn't get a backup with his rental light.