If its a bad battey, and not accepting the charge
Charge battery overnight with 12V charger, see how it is, Sounds like your battey is dead though, I've taken many cars with pure dead battery, jumped it, and the alternator had it in good shape after 20 minutes. I dont recommend relying off Alternator charge, id do that in event my battery died for leavin a light on or something, then id charge it at home immeadatly.
