There is some type of electric drain on the battery.
Having an electrical drain on a car battery can cause a battery to die prematurely. Since you are aware that this is going on with your Chevy, I highly recommend enlisting the assistance of a certified mechanic to come by and perform a parasitic drain test on your Chevy. They will have the tools and experience necessary to perform this test and determine what is draining your battery. They will also be able to make the repairs necessary so you won’t worry about having your battery drained overnight.
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