Not as promised but still very good price / performance ratio

On the 20,000 mAh but you should not rely on. At least not by calculation:
My phone has a 1200 mAh Akku.Theoretisch it should be with the PowerPank ie over 16x invite lassen.Tolleranz and consumption during charging roughly peeled, one might expect 10x.
Far from it: for max 6 charges was over for me.
BUT: In this price range (35, -) is still a super power. Most of the other batteries in disem area are unsuitable for smartphones and not even provide a full charge.