2021 Yukon Denali - Battery alarm is LOUD - what makes it stop?

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tagexpcom

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Recently installed a new battery and then a few weeks later a bluetooth battery monitor.
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Both times this EAR-SPLITTING alarm goes off when the battery terminal is disconnected.... I feel sorry for auto-shops that have to work on electrical systems.

Frantically clicking the Fob but not sure it made any difference. It did stop after a minute? or 2. What's actually happening and does it stop on it's own after a few mins or did clicking Fob actually do something?

Info welcome as I'd like to be the most prepared I can be the next time I fool with the battery :)
 
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