5.Due to the strict policy of international logistics for batteries, the built-in lithium battery pack (the battery of this machine has been unable to store power normally) and the button battery will be removed before shipment, and the goods you receive will not contain the battery, and you may need to install a button battery yourself after receiving the goods.When I remove it, I will take a picture to show you the installation location and battery model, and you can purchase and install it yourself.