During the charge cycle hydrogen is produced in the process. Different types of batteries handle the gassing process differently, and each process can be directly related to battery cost. The standard wet cell, commonly related to the car battery, just vents the gas into the air, normally the quantity is such that the concentration is not explosive. Sealed batteries will vent, but normally the gasses are contained, depending on the charge rate. In all cases one would want to consider a separated space for the batteries, certainly not within the living space. Ideally, storage batteries would be placed in cool, dry and vented locations (batteries release hydrogen gas). Sheds or garages are good places. The contents of batteries should not be subjected to boiling or freezing. Freezing will only occur when the batteries are in a state of discharge.
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