Both Porsche and Bugatti, who both use12V lithium car batteries recommend the regular use of a Lithium battery charger and conditioner. Bugatti actually say that if the car is being left for more than a day or so, it should be connected to its charger conditioner. Now I would assume that they both use the highest quality Lithium batteries, with internal charging control electronics but they still recommend (or in Bugatti's case it is obligatory) use of an external charger.
Wilson
