I'm still having battery problems. Several days ago, after my 1988 735iL sat for several days, the battery was dead. I charged it overnight and it started. I had the dreaded PPPP on the OBC for two days and then that cleared up. Here's the weird thing. My cruise control has not worked for several months, yet it started working also at the same time the PPPP went away. Then, the next day, it quit again. I still have "Check Control" on my dash and the OBC functions do not display on the dash. Could all this be related to the battery? Each time I have had the battery checked, it has been fine. Help! TIA.