If the battery under a specific Voltage, the charge circuit will not be start to work. This behavior I've seen also on an old tablet. So I'll believe the charge circuit in the Anafi works simular. If the battery has a short circuit by himself, so I'll believe, that the charging circuit is defect... (N-Fet) so happen one time with a brand-new accu for the Disco. I've open the accu, remove the charge circuit and charge the acce with a good Lipo charger instead of the standard wallplug. Uncomfortable, this one is with the Lipo from the Anafi not possible