It would be grear if the battery drain could be reduced when not in use.
That being said, IMHO it’s not that a big deal considering how easier/quicker i find it to open/close the battery compartment on the retra vs on my Inon Z240. And easier to inspect oring too.
Some people have complained that the retra flash won’t stand still if put facing down (since the lighting surface is curved) but i consider this being a non-issue for me, as i always carry a micro-fiber towel with my spare batteries / spare kits, so i just put the retra on it and that does the trick of stabilizing it during battery swap.
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I never leave batteries in my flashes for more than a day before or after a dive. I have had too many old-school alkalines explode or corrode for unexplained reasons. So, no worries for me as I am always using freshly charged ones. I concur with Tom that using the extender packs can get you easily 4-5 dives even if they are strobe intensive.
as for the flashes "rolling" my suggestion is to buy the protector rings. This allows them to stand upright and are very solid during battery changes. I leave them on all the time unless I am using another accessory.