Ok just picked up a 718 6 speed base in October not one issue love the car. I was told at local dealer it’s a good idea to buy the $214.00 charge o mat pro battery charger and charge up battery when out for a long ride and told to turn ignition on then plug into cig lighter under arm then plug into wall then turn key back so car won’t go into sleep so last time I went for a 5 hour ride came back I plugged the charger in and the charger got hot and it showed it was almost full after a few min I checked the cig lighter to see if I pushed something in with the charge plug but nothing and started over. So I unplugged and left alone. Haven’t used car yet one week so far. I bin charging battery for about 2 months and never did anything except starting from empty to full and never got hot. warranty is coming to an end allso the last time I took the car out the coolant gauge was half way to normal running temp in the matter of a few min I never saw it act like that before I’m worried this charger is doing damage if that’s possible.