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I think you should load test your battery. To me it sounds like its bad. How old is it?
You should have over +13v with the engine running. Also use a VOM for AC(yep AC)voltage across the battery with the engine running. IF you see more than 1AC volt across the battery... your alternator is bad.
It could also be something with the Intelligent Battery Charging System. Can your scan tool code your battery?
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