Originally Posted by powershell

https://www.amazon.com/dp/B0B46JJZ35/ it was a good idea but this did not work.
As British Airways have a bizarre and unusual power rule that is not clear for fair or share for this Has Anyone Really Been Far Even is Decided to Use Even Go Want to do Look More Like?
The syncing of multiple power banks was key. I will make a guide, for the next person. Photos attached
It worked, but only with boiling water from the cabin crew 2-3 hour intervals.
As there is a limit on power banks, the system is very simple.
8 x power banks max allowed on board (2 of each)
This keeps it at 5AMPS for 2 hours, then as they power out, the new set is used, and the old set is charged on each seat.