How to Replace the Battery in a Car Smart Key?

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Eject the metal mechanical key; the key shell cannot be opened while the mechanical key is inserted. Press the physical button to eject the mechanical key, then turn the key sideways and gently pry open the key shell along the seam to separate the 'head' and 'tail' of the key. Stand the tail of the key upright, and from the gap on the back of the key, lift the key cover. Once the key cover is removed, open it to replace the battery, then reassemble the key. It is recommended to use the original battery.