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You seem a little confused by the type of battery used. A sealed lead acid battery is just that. Completely sealed. That is however not the same with a liquid electrolyte battery such as found in a car or pick up truck. Those have vents for off-gassing any breakdown of the electrolyte causing hydrogen gas. And the amount of off-gassing from said battery is not enough to cause too much concern on a newer battery. If the battery was, for the sake of the argument, 10 or more years old and had no maintenance done to insure the electrolyte was kept up, then the amount of off-gassing due to the battery not properly taking a charge can be a concern.
Japanese Beetle Trap
I hate to break it to you, but you can just take a 5 year old walk behind lawnmower, cut an opening into the mowing deck's top, mount an alternator to said new opening, mount a belt pulley to the output shaft, mount the belt, adjust for the slack, and lastly establish the method =for connecting the connections from said alternator to the battery(ies) you wish to charge. And for the cost of a few liters of petrol and about 30 minutes in time, you can have a battery ready to pop into the car or truck and off you go on your way.
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