To optimize battery health when storing your Porsche for extended periods of time, the Charge-o-Mat Pro features trickle charging and battery monitoring functions. The Charge-o-Mat Pro has two modes for Porsche 12V lead-acid batteries and Porsche 12V lithium-ion batteries (12V LiFePO). An optional adapter is available for vehicles without cigarette lighter (part number: 958 044 901 75).