Taking Batteries on Planes.
If you are travelling on a plane anywhere in the world and want to carry a power bank with you, it must be under 100 Watt Hrs, to comply with safety regulations, and be clearly marked on the power bank.
Power Banks can only be carried in your carry on luggage.
As a general rule power banks around 28,000mah will just fall below the 100 wh rating and anything above will have to be cleared with the airline.
Batteries on Qantas.
All spare batteries and powerbanks must be as carry-on baggage only.
www.qantas.com
Batteries on Virgin Australia.
Spare/loose batteries (including power banks/packs must be in carry-on baggage only.
www.virginaustralia.com
Batteries on Philippine Airlines.
Lithium ion (rechargeable) batteries are limited to a rating of 100 watt hours (Wh) per battery.
With airline approval, passengers may also carry up to two spare larger lithium ion batteries (101-160 watt hours). No more than two spare batteries may be carried in carry-on baggage.
Batteries must be protected from damage and short circuit. The terminals of spare batteries must be protected to prevent short circuit by using the original battery packaging, taping the terminals and putting batteries individually into appropriate plastic bags.
www.philippineairlines.com
Batteries on United States Airlines.
Spare (uninstalled) lithium ion and lithium metal batteries, including power banks and cell phone battery charging cases, must be carried in carry-on baggage only.
www.faa.gov
Batteries on United Kingdom Airlines.
Carry-on Baggage: Yes.
Checked (hold) Baggage: No
www.caa.co.uk