Can You Take A Backup Battery On A Plane. Size Limits for Lithium Batteries. Most of the major airlines including American Airlines Delta Airlines Southwest Airlines and more are reportedly banning the use of smart luggage win non-removable batteriesHowever the ban is only for checked baggage and doesnt apply to carry-on.

Lithium batteries with more than 100 watt hours may be allowed in carry-on bags with airline approval. Can I take my battery backupenergizersecondary power source in flight. So you dont need to call them up you can bring 2 larger battery banks its written on their website that you can.
You can also bring rechargeable AA NiMH or NiCad batteries.
Test Gear Before You Travel. If the charger has an electrical cord be sure to wrap it tightly around the charger. Backup Power is Useful in the Airport. External chargers or power banks are also considered to be a battery and should not surpass a capacity of 27000mAh or in other words 100Wh.
