In a lead acid battery
Load Oxide is the active mass on the negative plates
and spongly lead is the active mass on the negative plates.
The charge/discharge of the Lead Acid Battery is known as double sulphate reaction.
DURING CHARGING :- Lead sulphate is converted to metallic lead at negative plate and lead dioxide at positive plate are converted to lead sulphate.
Lead electronics react with acid and is converted to lead oxide. As more reaction takes place, plate grid is distorted andshedding of active material takes place.