Airports by country that deviate from U.S. regulations
AirFrance/KLM
Lithium-ion battery powered wheel chairs and other mobility aids for passengers with walking disabilities: Removable batteries with a capacity exceeding 300 Watt-hours (Wh) are now permitted. You must be pre-approved when traveling with any mobility device. To do so, click this link, then scroll down to "prohibited items" and select "self balancing devices". A new section will appear which says, "Do you have reduced mobility?" A link will appear which says, "Request permission". Click that link and follow the prompts.
China (all airlines)
The batteries for your wheelchair or mobility device must pass the tests specified in Section 38.3 in Part III of the UN Manual of Tests and Criteria. Li-ion battery for a wheelchair:
If the battery can be removed:
1. The battery can choose not to be removed, but must be insulated, and disconnected from the wheelchair and then consigned for shipment.
2. Removed battery enclosed within a battery container, and carried onboard in carry-on baggage. Each battery's capacity cannot be greater than 300 W/H.
3. In addition to the wheelchair battery, a spare li-ion battery with a capacity lower than 300 W/H or two spare li-ion batteries with a capacity lower than 160 W/H each are allowed in carry-on baggage.
If the li-ion battery cannot be removed: The battery must be insulated and disconnected from the wheelchair and then consigned for shipment.
If a portable medical equipment contains a li-ion battery, take the battery certificate with you. Due to some countries having different regulations, we suggest that you contact our local reservation office in advance for better arrangements.
Source: https://www.china-airlines.com/tw/en/fly/prepare-for-the-fly/special-assistance/index
LATAM Airlines
If you travel with your wheelchair with a lithium battery, you can transport it if you use one battery not exceeding 300 Wh or 2 batteries not exceeding 160 Wh each.
Emirates
Folding mobility scooters using lithium-ion batteries: The lithium-ion battery must be removed from the scooter and transported in the cabin. These batteries shall not exceed 300 Wh in capacity if the mobility device is equipped with one battery. If the device uses two batteries, they shall not exceed 160 Wh each. One additional (spare) battery of up 300Wh, or two additional (spare) batteries up to 160Wh each are permitted, and also must be transported in the cabin. More info
Air Asia
How can my batteries be taken on board?
The lithium-ion battery capacity cannot exceed 300 Wh for mobility devices using one battery. For devices using two lithium-ion batteries, their individual capacity cannot exceed 160 Wh each.
One additional (spare) battery not exceeding 300 Wh, or two additional (spare) batteries not exceeding 160 Wh each, may be transported in the cabin, and must be placed in a manufacture-sourced battery pouch.
IcelandAir
IcelandAir has no specific published policy towards transporting the TravelScoot, but here is a recent response from IcelandAir’s special services department.