How to judge whether your electronic equipment can be brought on the plane

　　1. Determination method for additional energy of lithium battery If the lithium battery is not directly marked with additional energy Wh (watt hour), the additional energy of lithium battery can be converted according to the following method:

　　(1) If the nominal voltage (V) and nominal capacity (Ah) of the battery are known, the value of additional watt hours can be calculated: Wh=VxAh, and the nominal voltage and nominal capacity are generally marked on the battery.

　　(2) If the battery is only marked with milliampere hours (mAh), divide this value by 1000 to get ampere hours (Ah).

　　(3) For example, the nominal voltage of lithium battery is 3.7V, the nominal capacity is 760mAh, and the additional watt hours are 760mAh/1000=0.76Ah; 3.7Vx0.76Ah=2.9Wh

　　2. Maintenance measures for spare lithium battery The spare battery must be maintained separately to prevent short circuit (put it in the original retail package or insulate the electrode by other methods, such as pasting tape on the exposed electrode, or put each battery in a separate plastic bag or beside the maintenance box).

　　3. The portable lithium battery that can be carried can be used as hand baggage to board the plane with laptops, mobile phones, cameras, watches and other personal portable electronic devices containing lithium batteries of no more than 100Wh (watt hour) and spare batteries.

　　4. Generally speaking, the extra energy of lithium battery of mobile phone is 3~10Wh; The energy of lithium battery of SLR camera is mostly 10-20Wh; The lithium battery energy of the camcorder is mostly 20-40Wh; The lithium battery energy of notebook computers varies from 30 to 100 Wh. Therefore, the lithium batteries in mobile phones, common camcorders, SLR cameras and most laptop computers will not exceed the limit of 100Wh.

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