Having an issue with my battery. For the first couple of weeks my 47 would start right up. Afterwards it would take a little bit to start. Now after being on the battery charger it will not crank over but once i get it to crank over and it starts, I can turn the key off and then start the car right back up for the rest of the day. I have went thru 3 batteries. The cell keeps going bad in them. What could it be?