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2006 Hyundai Elantra - Battery drain issues

When I turn off car the battery is drained.
When the negative cable wasn’t tight on the battery post car would start.
When I got a jump and tightened the negative cable so there is no movement the battery is drained when I want to start the car again after I turn it off.

Car won’t start? Replace battery. It’s new?

You have a parasitic drain… have a mechanuc test for that. Likely the problem is an aftermarket alarm, radio, amps, or remote starter that has partially failed.

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From what you say about the issue it sounds like the battery has an internal connection problem.