August 25, 2019
IMO, The "Weak Charging Detected" notification is obviously an error in one of Samsung's pre-installed maintenance apps that updated over the Summer.
To stop this false notification, I opened the "Samsung Members" application on my S-9, navigated to "settings", then turned off the switch for "Diagnostic Notifications".
Restarted the phone, and the annoying "Weak Charging" notifications have not reappeard. I hope this EASY "fix" is as effective for everyone else as it was for me. Good luck!
-Allen in Chicagoland
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