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I've seen similar faults caused by a faulty alternator regulator. They charge the battery, but they can allow the battery to drain down.
A quick check would involve only unplugging the alternator overnight and see if the battery drains. If not, then get the alternator checked out by a pro.
It's worth a try.
I think I have CDO. It's like OCD, but with ALL THE LETTERS IN THE RIGHT ORDER
Currently in Gonescenile's garage:
A wee French toy & a 2010 Honda VFR 800