How to Replace the Battery in a Changhe Key?

[VonAlexander]

Eject the metal mechanical key; the key shell cannot be opened when the mechanical key is inserted. Press the physical button to eject the mechanical key, then pry upwards along the gap. Gently pry open the key shell to separate the "head" and "tail" of the key. Stand the tail of the key upright; when the key is upright, you can lift the key cover from the gap on the back of the key. After prying open the key cover, open it to replace the battery, then reassemble the key. Be sure to use an original manufacturer battery.