The Exide Edurance range of products helps support the mechanical properties of rolled expanded grids, whereas the traditional silver assitiove has proven to have no impact. In extreme conditions, grid corrosion is limited by the addition of Ap9 and by a low calcium content. Additionally, when batteries endure long term storage and overcharging at high temperatures, battery life is increaded with the addition of Ap9 no matter whhat the technology. Ap9 improves the battery recharge ability after a discharge.