Recent content by frisket

Thanks very much. I found the +/- symbol on the charger, so it's +ve outside. 19.5v and 90W are clearly marked (once I got a seriously powerful zoom lens) so I've ordered a 4.5mm×3mm-to-USBC adapter because all the new powerpacks assume USB-C

I have a HP Envy 17" laptop and I need a powerpack that will recharge it (preferably twice) so that I can work in a location with no mains power (new battery life is only 2hrs) The mains charger that came with it says 90W, and the HP docs say the internal battery is rated 55Whr. Has anyone...