Can I bring a light up mirror on a plane? Light-up mirrors frequently include batteries, which are constrained by a number of laws. Commonly used in electronic devices, lithium-ion batteries are typically permitted in both carry-on and checked luggage. Due to the possibility of fire, there are limitations on spare or loose lithium-ion batteries. There are restrictions on the size and number of spare batteries that are permitted, and they must normally be transported in your carry-on luggage. It is advisable to confirm compliance with the exact battery rules set forth by your airline.