Active Material
WARNING: This page is about a different car, the 2010 Volvo V70, 2009 Volvo V70, and 2008 Volvo V70. 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