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"Discharge while stopped" means that the IBS system in the car detects that other electrical systems in the car are drawing more than acceptable power when the vehicle electronics are supposed to be asleep. Tools like ISTA will show you stored logs indicating which circuit branch violated the rules and sometimes even the exact module.
It may very well be that the act of you working on the battery and disconnecting it long enough to do all that cleaning rebooted a module with a software problem and that was the true fix.
There should not be corrosion on your battery posts, and you should potentially investigate that all on its own. Typically this means that acidic gases are being expelled by the battery around the post seals. This is not normal. The battery spec for the F10 is AGM - gas production should be minimal and the seals should keep it in.
Is your F10 fitted with an aftermarket or improper specification battery? Has the battery been physically damaged or lifted by its posts? Have you checked that your system voltage is not too high (it should be between 13.5VDC and 14.8VDC while the engine is running, depending on many factors)?
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