I fully charged all three
Mini 2 batteries 2 months ago to 100%, leaving two in the hub and the third in the drone. I just checked all three. The two in the hub are showing a single light and the one in the drone is showing 2 of 4 lights. This is inconsistent with the auto discharge not working. For the two in the charger to be at 25%, they must have first auto discharged to 72% after 5 days. Same with the one in the drone that only had two lights. Clearly, they are discharging. Also, prior to this, I flew the drone for several weeks and the batteries always auto discharged according to the manual, while stored in the drone and the hub. Perhaps there are different FW versions? I also would not trust any reply from DJI. They don't have any idea what they are talking about most of the time!
"...the battery will be THINKING it will be used soon and will not enter into self-discharge."
Seriously? One battery is always stored in the drone. I truly wished I could stop the auto-discharge, so I hope you are right, but my own experience says otherwise. Will do more testing. All batteries are now on the hub charging!