Why airlines are warning over lithium-ion batteries

Airlines are telling people to be careful with lithium-ion batteries. These batteries are in many devices like phones and laptops. They can be dangerous on planes. Sometimes, they can catch fire. This is why airlines are giving warnings.

Passengers should follow some rules. They should keep batteries in their carry-on bags. It is safer this way. If there is a problem, it is easier to fix it. Airlines want everyone to be safe. So, they ask people to be careful with their batteries.