Discharge Action.
During discharge the complicated but uncertain action at the positive plates (hydrated oxide of nickel) cause’s hydroxyl ions (OHˉ) to be introduced into the electrolyte. As the action progresses the nickel hydrate is changed to nickel hydroxide. .Simultaneously, hydroxyl ions (OHˉ) from the electrolyte form cadmium hydroxide with the cadmium of the negative plates. Effectively, the hydroxyl ions (OHˉ) move from one set of plates to the other, leaving the electrolyte unchanged. There is no significant change in specific gravity through the discharge/charge cycle and the state of charge be found sing a hydrometer
Charging
A direct current supply for charging is obtained from ac. mains, through the transformer and rectifier in the battery charger. The positive of the charging supply is connected to the positive at the cell, and negative to the negative terminal. Flow of current from the charging source reverses the discharge action. The reactions are complicated but can be summarized by the simplified equation:
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