Hello, much has been asked about the rMb new charging options (external battery pack, usb chargers, ...) and I love this potential flexibility... but I'm skeptical. Today I received my usb-c / usb-a cable so I could test : - charging via an external battery pack (5V / 2.3A) - charging via a usb charger (5.3V / 2.0A, Samsung Galaxy Tab charger) ... and I'm a little disappointed : in regular use (web browsing, office and max screen luminosity), my battery was dropping. Maybe a little slower than on battery, but still (about 1% per 8mn-10mn). Did anyone obtain better result with alternative charging ? Maybe with a more powerful charger or external battery pack (Anker ? Tecknet ?) Thanks !