Watch stopped charging. Can we change the battery?

"Hi @twin ,

Here is a video that shows how to access, remove and replace the battery in a DZ09 smart watch.

Here is a link to just one supplier of a replacement battery. It is not a recommendation to use them. It is shown to give an idea of the cost of the battery. There are other suppliers online that may suit you better. Just search for FYM-M9 battery to get results."