Could be couple of things,
A bad battery not holding a charge, should be a little over 12 volts with engine off.
A bad alternator not charging, should put out between 14 to 15 volts with engine running.
If there is an advanced auto near you, take them there, they will check them for free.
Sounds like you have a bad alternator, get a volt meter jump battery start engine check voltage at alternator, after you remove jumper cables, if you have 13.5 volts alternator o..k. if not replace alternator.
The alternaor is not charging
need a new alternator
Your alternator is dead.
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