Electrolysis and Storage Batteries
Each cell has a vent cap

all of the listed here
to add water to the cell if needed
to check the level of electrolyte
to allow gases out when the cell is on charge

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Electrolysis and Storage Batteries
Life of the batteries is in the following ascending order.

Lead-acid cell, Edison cell, Nickel cadmium cell
Lead-acid cell, Nickel-cadmium cell, Edison cell
Nickel-cadmium cell, Edison cell, lead-acid cell
Edison cell, Nickel-cadmium cell, lead-acid cell

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