Charge car battery using LiPo Charger

How to charge your car or motorcycle Pb (lead-acid) battery using a LiPo RC Turnigy Accucel 6 charger. The process mentioned will work for most 4 button LiPo chargers.
So no need to by a separate expensive car battery charger if you already have an RC iCharger.
This proces works for 12V lead acid batteries and also for many other voltages.