Originally Posted by
WilcoRoger
I'm in a similar situation - my 2013 MBA's battery is at about 80% of design capacity. I'm totally happy with the computer, so I still give it some time for the battery to further deteriorate. Meanwhile I just plug it in on longhaul flights
and I also have one of these 16Ah batteries
https://www.amazon.de/gp/product/B005N92WNG (main thing - it has 19V DC output)
with this cable
https://www.amazon.co.uk/gp/product/B00HQHTUGU
Charges the MBA and any gadget that charges via USB
Thanks for the tip. Will look into buying them.