I'm not sure I made myself clear by reading your response. I did not want to start a new thread as it seemed to be related at a glance with the topic - cannot use anything else to power / charge the tabletbook except the onboard charger. I tried a variety of devices, including fast chargers for cars, 4 types of external batteries and no result. So the simple question is: is there something preventing this from happening? they all work, they all charge other devices except for the Pavilion. Mainly I'm interested why external batteries don't simply work with it, as on a 12h flight, the normal onboard battery is insufficient, for example.