If your electric toothbrush is dry cell, it can be checked in or carried on. If your electric toothbrush is a lithium battery, it cannot be checked in and can only be carried on.
Portable electronic devices containing lithium or lithium-ion battery cells or batteries for personal use by passengers or crew members
(watches, calculators, cameras, cellular phones, laptop computers, portable video cameras, etc.) should be carried on board as hand baggage, and the lithium content of lithium-metal batteries should not exceed 2 grams, and the rated energy value of lithium-ion batteries should not exceed 100Wh (watt-hours) ). Those exceeding 100Wh but not exceeding 160Wh can be loaded on the equipment in the delivery baggage or hand baggage with the approval of the airline. Lithium batteries exceeding 160Wh are strictly prohibited.
Spare batteries for portable electronic devices must be individually protected against short-circuiting (by placing them in their original retail packaging or otherwise insulating the electrodes, e.g., by taping the exposed electrodes, or by placing each battery in a separate plastic bag or protective case) and may be carried in hand baggage only. Only two spare lithium batteries of 100
-160Wh approved by the airline may be carried.
Passengers and crew members carrying wheelchairs or other similar mobility devices powered by lithium-ion batteries, and portable medical electronic devices containing lithium metal or lithium-ion battery cells or batteries carried by passengers for medical purposes, must be carried in accordance with the transportation and packaging requirements of the Technical Regulations and approved by the airline.