Compounds (normally applied as a paste) which are active in the battery's plates. Specifically refers to lead dioxide in the positive plates, and metallic sponge lead in the negative plates. When an electrical circuit is created, these materials react with sulfuric acid during charging and discharging.

The material in the electrodes of a battery which takes part in the electrochemical reactions of charge or discharge.

The electrode material that takes part in the electrochemical reactions that store/deliver electrical energy.

electrode material which produces electricity during its chemical conversion.

The active portion of the battery plates; peroxide of lead on the positives and spongy metallic lead on the negatives.

This refers to the positive and negative plate pastes that provide energy from a battery when it is discharged. For a lead-acid battery, the positive active material, or PAM, is lead dixide; the negative active material, or NAM, is sponge lead.

The material which reacts chemically to produce electric energy when the cell discharges, and which is restored to its original state during the charge.