Porsche OEM maintainer and charger works with most modern Porsches Easy to use through the cars 12v outlet (cigarette lighter) Can be used with both lithium-ion and lead-acid batteries Perfect for keeping your car's battery fresh while the car is not in use Included bumper helps protect your car and the maintainer from damage The Porsche Charge-o-mat Pro (5.0 A) includes trickle charging and battery monitoring functions as well as two charging modes for Porsche 12V lead-acid batteries and Porsche 12V lithium-ion batteries (12V LiFePO). This product is compatible with the following models: Boxster (981) Cayman (981) Boxster (987 II) Cayman (987 II) 911 (992) 911 (991) 911 (991 II) 911 (997 II) Panamera (G1) Panamera (G1 II) Panamera (G2) Panamera (G2 II) Macan (I, II, III) Cayenne (E1 II) Cayenne (E2) Cayenne (E2 II) Cayenne (E3) Cayenne (E3 II)