belt needs to be tighter and remove all oil and grease with cleaner and possibly use some belt dressing
It's almost certain a problem with the alternator
either the alternator or the voltage regulator are no good.may also be a bad battery
Yes, alternators are designed to maintain the battery, or recharge a battery that has been slightly discharged from starting the car. When the alternator is used to recharge a dead battery, it causes the alternator work harder and longer than it is designed for, causing it to overheat, thus causing damage to the alternator. A battery charger should be used instead. They are designed for charging dead batteries. After the battery is charged, let the alternator maintain the charge.
Defective alternator or internal voltage regulator is bad.
Your battery is weak, or your your alternator is not charging battery.
Failed battery, or alternator is overcharging.
poss alternator fault
Something is usually on that you don't know about like an alarm could be draining the battery. However, If its not starting you should check the starter though. It will make you think the battery is bone dead.
Can be loose or corroded battery connections, loose drive belt, or the alternator is failing.
Alternator is defective and needs replacing.
could be a bad battery
It's not charging the battery. Check the alternator.