I'm guessing but were you on AC when you had the probs? The peak the charger is looking for to terminate the charge on is only a few mv. If something else somewhere in your house thats connected to the same circuit turned on or was turned off, that can be enough to cause the false peak. I had a lot probs with false peaking until I moved the charger to a diff room that was on a diff electrical circuit in the house. My probs were only at high charge rates at the max or near max charge rate charger would run at. Lower charge rates this is not as much of an issue.

False peaks can also be caused by voltage spikes from the utility company.

I can't find a good pic of the charger when its on, so I have no idea what the number is. The voltage is either the input voltage to the charger or the volatge across the battery while its charging.