We were driving home from our labor day vacation and the battery was below 25%. we notice certain functions were no longer working, ie cruise control, the map guidance was funky, and some other features. When we got home and put the charger in, eventhough we have the charger to start charging after midnight, it immediately started charging. Just wanted to now if these things are normal. Does anyone have a list of things that stop working after the battery gets below 25%..