Use a dvom and post the operating voltage.
With the engine running turn on all electrical apparatus what is the operating voltage.
Auto Zone and Advanced Auto will perform free charging analysis. If the battery goes dead overnight occasionally tell us this and we can help you find the problem.
Truthfully, without more information (battery brands/specs, location, driving habits, etc.) no one can really hazard an educated guess. You've given us nothing to go on.
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