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AEG SolarCube Pro error 170305110: what “Head unit undervoltage, level-3 fault” means

Error 170305110, Head unit undervoltage, level-3 fault, means the battery of the AEG SolarCube Pro is discharged too deeply and the battery management system has locked it. For days the app then says Battery Force Charging Mode while 2 to 6 W goes in. Our unit drained itself off the grid, sat locked for 4 days and 5 hours after it was plugged back in, and came out on its own. What each message means, why it drains while it looks switched off, and what does and does not help.