Hello,
I initially purchased an Anker power bank larger than the recommended, but after few weeks of noticing voltage was not OK, regardless of Rosetta being the only powered device, I decided to purchase the recommended 10000.
Today I went to fly for the first time on IFR instruction with Rosetta and this new bank, but it didn't power up. When on the ground, I tried to troubleshoot it, to no avail. Fully charged, 4 leds, starts up, internal LEDs but nothing happens, no PAW wifi.
I then tried the larger portable charger, to exclude problems with Rosetta itself... and it worked.
What could be the cause, other than a "faulty" bank (but still it powers up other devices)?