Sulphate build-up leads to premature failure of lead batteries because it reduces the effective surface of the battery's plates. As a result, the capacity decreases and with it the starting ability. A battery charger won’t help in this situation. However the Dometic PerfectBattery BR 12 battery refresher will, because it tackles the problem at its root. The BR 12 removes sulphate crystals that have built up on the plates and prevents the formation of new ones. Ideal for seasonal vehicles, such as vintage cars, motorbikes, motorhomes and boats.