ZMI QB821 Powerbank 20000mAh

I've used one of these during a kayaking holiday. With a bit of smart management of my phone (switching it to power safe while in the kano) I managed to get through 8 days with my S8+ phone while away from any power outlet. Fast charging of phone and powerbank. This one even has USB-C input - shame that mine hasn't but I'm very happy with it anyway.