Many times people get away with doing that but your alternator is built to keep a fully charged battery topped of, it’s really not a battery charger. If you do try this you take the chance of over working the alternator and doing damage to the unit. It may not show up the next day but in the next few months you may be replacing it. It’s always best to have a dead battery checked and charged using a proper battery charger.
#battery #charger #alternator