For the reliability of lead-acid batteries it is important to have an accurate prediction of its response to load
profiles. A model for the lead-sulfate growth is presented, which is embedded in a physicalechemical
model with 3D spatial resolution is presented which is used for analyzing the different mechanism
influencing the cell response. One import factor is the chemical dissolution and precipitation of leadsulfate, since its dissolution speed limits the charging reaction and the accumulation of indissolvable of
lead-sulfate leads to capacity degradation. The cell performance/behavior is not only determined by the
amount of the sulfate but also by the radii and distribution of the crystals. The presented model can be used
to for an improved understanding of the interaction of the different mechanisms