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I would be worried most about sparks while connecting/disconnecting the battery.
Both gas and hydrogen are explosive enough to be concerned about.
I doubt if there is anything spacial about mixing the two gasses.
It is a good idea to keep sparks away from anything flammable.
I just use a little battery to run the lights.
I have found a small maintence free compact car battery to work best for me.
I take it home and put it on the trickle charger between uses.
The desert destroys batteries left baking in the boat.