1999 Toyota Camry
I have a 1999 Toyota Camry and just had a quick question (consider it an average car battery). Usually before I go into school I sit in the parking lot with my car off, radio on at a comfortable level, and phone charging (this is probably for about 15 mins). I usually do the same thing during lunch (radio on for 10 mins. Phone charging for 25). Then after school I do the same thing for 15 more mins, then start the car and drive off. My car has never had trouble starting. I drive home about 5 miles going 35mph some of the way then up to 65mph probably 7/10 of the way, so the alternator most likely fully charges it every time since I’ve never had trouble with a low battery start. Am I doing more harm than good? Should I stop what I’m doing and leave my car idling when I do this instead? How bad does this affect the lifespan (or maybe it doesn’t?) of my battery?