What type of batteries are considered acceptable for transport in "smart bags" on SkyWest?

The correct answer is that removable batteries are considered acceptable for transport in "smart bags" on SkyWest. This regulation is in place primarily for safety reasons. Removable batteries can be taken out of the bag and stored safely if needed, particularly to prevent any potential issues such as overheating or short-circuiting during travel.

In contrast, non-removable batteries pose a higher risk because they cannot be easily accessed or removed in the event of an emergency. This can complicate safety protocols onboard an aircraft. Heavy-duty batteries may also fall under similar scrutiny due to their potential risks and are often not specified for use in smart bags. Lastly, stating that any type of batteries are permissible would not align with safety regulations that airlines typically enforce regarding battery transport. This highlights why the focus is on removable batteries, as they allow for safer management of battery-related issues during transit.