What electronics are allowed in carry-on luggage?

Most personal electronics are allowed in carry-on luggage, including laptops, tablets, smartphones, cameras, and headphones. Lithium-ion batteries, such as those in power banks and spare camera batteries, MUST be in your carry-on, not in checked baggage, due to safety regulations. There are typically limits on battery capacity (100 watt-hours per battery), but this is more than sufficient for most travel gadgets.