Active material
WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.
The active material consists of lead oxide in the positive plates and porous lead in the negative plates. The active materials react with the sulfuric acid in the electrolyte during charging and discharging according to the following chemical reaction:
PbO2 + Pb + 2 H2 SO4 = 2 PbSO4 + 2 H2 O