We do for our camera and strobe, but use regular Duracells (sic) for the flashlights. The regular batteries will last us an entire 2 week trip without having to open the lights like we would have to with rechargeables(sic). And the less I have to open my dive light, the less of a chance for a flood. So I'll just bring my regular batteries home and recycle them like I always do.
My wife's and my light take a total of 24 C cell batteries (8 for the hand canon, 4 for the backup). When I looked at the amount of battery waste that we would have with those, I switched out the hand canons from xenon to LED. The burn time with fresh rechargeable batteries lasts for a two week trip's worth of night dives. We also haul a charger with us; just in case we do more night dives than originally planned. We also take 24 AA rechargeable cells for our cameras and strobes.
Opening the lights to take out the batteries for charging, give us the opportunity to do a full maintenance cycle including thoroughly cleaning out any salt contamination and allows us to re-grease the O rings. It only take's about an hour to do the full maintenance cycle on all "floodables" so we do the full cycle once a week during each two week vacation. Not a big deal rally, and we save both on the cost of alkaline batteries and landfill space.
I did not mean to imply that using alkaline batteries is wrong. Some agency "rules" do not even allow for the use of rechargeable batteries in primary dive lights. What I was more trying to get folks to think about was their pollution footprint when travelling.
For example, it's odd how some folks will do everything in their power to reduce their electricity costs when at home); turn off lights when not in the room, and dial back the AC when no one is in the house; but then turn on every light and crank up the AC in their hotel room and head out to the beach.
Or, rather than take a travel mug with them, will belly up to the bar and go through a ton of those little plastic cups that end up in landfill; especially when going to islands that may not have the more advanced recycling/waste disposal facilities as other countries.
A few years ago, we opted to change how we travel slightly, and try to leave less waste than we did in the past.
No insult was intended, just offering an alternative way of doing things.