Battery refresher, 12 V. Sulfation leads to premature failure of lead batteries as it reduces the active surface area of the lead plates. This results in decreased capacity and consequently reduced starting ability. A battery charger won't help in this case. Instead, the Dometic PerfectBattery BR 12 Battery Refresher is the solution of choice, as it directly addresses the root cause of the problem. The BR 12 removes sulfate crystals that have accumulated on the plates and prevents the formation of new crystals. Ideal for seasonal vehicles such as classic cars, motorcycles, motorhomes, and boats.