1982 honda nighthawk cb750 charging issue?

ello everyone, i have a 82 750 nighthawk and im not to sure what to do with her, the battery, when charged, will keep the bike running but once its dead, so is the bike. We had a local shop change out the complete charging system, stator blah blah and a year later its back to its old tricks. What do you think it is? Is there anyway to be sure?

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