Best i can remember there was a programming on certain models that involved hooking the battery up and using a momentary switch and counting led blinks. This told the charger if you were using lead acid or gel cells and charge voltage. They called it setting the logarithm. This may have some bearing on the BDI and such. Also check the pothole switches. Just a thought. BTW setting the correct logarithm is a pain in the.......well you know.