Which leads to my mind to become a star deduction is the enormous lamge charging time. She is on first-time charge no less than almost two days (48 hours). I can give at this point without information about the new charge at discharge. My Grundig sonic toothbrush needs only 3h in full charge and also stops at two-time usage per day per week (and even longer) by, without re-charging.
This should in my opinion be possible even with Oral-B.
Who it does not interfere with the toothbrush and permanently to the charger has definitely recommended.