You can carry a laptop computer with a lithium battery rated energy value not exceeding 100Wh (watt hours) on an airplane.
The Civil Aviation Administration of China regulations on carrying electronic products are as follows:
Portable electronic devices containing lithium batteries for personal use can be carried on board as carry-on baggage, and the rated energy value of the lithium battery must not be More than 100Wh (watt hours).
Devices exceeding 100Wh but not exceeding 160Wh can be installed in checked baggage or carry-on baggage with the approval of the airline. Lithium batteries exceeding 160Wh are strictly prohibited.
Backup batteries for portable electronic devices must be individually protected against short circuits and may only be carried in hand luggage. Only two spare lithium batteries of 100-160Wh approved by the airline can be carried. ?
Extended information
Passengers carrying lithium battery-powered wheelchairs or other similar means of transportation and portable medical electronic devices containing lithium batteries carried by passengers for medical purposes must Carry it in accordance with relevant regulations and requirements and be approved by the airline. Passengers can consult with the airline in advance for assistance.
According to the regulations of the Civil Aviation Administration of China, lithium batteries carried on board must meet relevant safety requirements. It is recommended that passengers purchase lithium batteries produced by regular manufacturers from regular channels to avoid causing harm to themselves or others.
Civil Aviation Administration-Security Check