When you say you had the battery checked, was it load tested? Sounds like the battery has a shorted cell in it.
If the engine will start and run by jump starting, but have electrical issues then this sounds like a battery issue.
Here is a guide that will show how to load test this battery:
https://www.2carpros.com/articles/car-battery-load-test
Let me know if you had this performed and if nothing else, I would replace the battery just to completely eliminate this as the cause as I am pretty sure it is a battery issue.
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Friday, May 7th, 2021 AT 8:26 PM