If the battery died in 3 days and nothing was left on, you probably should get the battery tested/replaced. It is well known that cars these days will show many problems with a simple electrical problem like the battery being bad.
You may want to ck the system for a draw. Make sure the glove box lite is not on. And you will need a starscan to reset the code.
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Master Chassis tech, Transmission
Automatic and Manual and Suspensions.
Also repair front and rear diffs and all engine
repairs inc Diesel. A/C repair too.