> For the complete documentation index, see [llms.txt](https://key.hideez.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://key.hideez.com/troubleshooting/how-to-change-the-battery-untitled.md). # How to change the battery? To replace the battery - open the case, prying the gap between the halves with a fingernail or a plastic card (do not use metal objects). Remove the old battery by pushing it from the inside with a narrow plastic object. Install the new CR-2032 battery with the narrow side (negative contact) to the board. Hideez Key-2 will beep and then ready to go. \ All user data is stored in non-volatile memory, when power is turned off (removing the battery), it is stored. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://key.hideez.com/troubleshooting/how-to-change-the-battery-untitled.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.