You recycle the old dead battery
Have no idea why you even put that back in
Common sense & your friend is correct
You don't disconnect anything on today's
vehicles, even with the key on
Put in a new battery,start the car, warm it up
& drive it for awhile & maybe you will get lucky
& it will complete some of the drive cycles & run some
monitors ,you know nothing about & it will be fine
If not, your mechanic friend should be about to stop
by with the bosses scan tool & help you out
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