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Home >> Volvo >> 2008 >> S40 T-5, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Battery, Brakes, Central Electronic Module (CEM), Climate Units, Engine Management System (Ems), Diagnosis - Design And Function (644 Body)) >> Battery (All) >> Terminology >> Active material

Active material

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The active material consists of lead oxide in the positive plates and porous lead in the negative plates. The active materials react with the sulphuric acid in the electrolyte during charging and discharging according to the following chemical reaction:

PbO2 + Pb + 2 H2 SO4 = 2 PbSO4 + 2 H2 O

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