Galaxy S7 Edge Charger Case, Qirg 5200 mAh Portable External Backup Battery Charger Cover Case Pack for Samsung Galaxy S7 Edge Rechargeable Power Bank Case (Gold)

Does not hold the charge and the charging is very inconsistent: sometimes it will charge sometimes it won't. I can not rely on it for important matters, if I have to count on my phone being charged by this back-up charger... I will try to return it because most likely the one I received is defective.