> For the complete documentation index, see [llms.txt](https://key3.hideez.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://key3.hideez.com/guide-for-hideez-key-bundle-with-bt-adapter/interface/service-operations/battery-maintenance.md).

# Battery maintenance

Hideez Key – Battery maintenance

Hideez Key comes with a pre-installed battery.

{% hint style="info" %}
In case your Key does not switch on, please, check if you [removed the white plastic](/guide-for-hideez-key-bundle-with-bt-adapter/fist-installation-and-launch.md#step-0-remove-isolating-material-from-the-keys-housing) from the Key's housing.
{% endhint %}

### Hideez Key 3

The case is made of two halves latched together. To replace the battery, open the case and lift 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 using a narrow plastic object. Install the new CR2032 battery on the narrow side (minus contact) of the board. Hideez Key will start to work.

Opening the case.

![](https://content.gitbook.com/content/9nGVLHTEc9xm8q0C0j6I/blobs/L47fgkmUdIYCBMKUj3Le/image.png)

Changing the battery.

![](https://content.gitbook.com/content/9nGVLHTEc9xm8q0C0j6I/blobs/PogpZGqBhq8Dtf1k5tvC/image.png)

{% hint style="success" %}
The estimated operation time of Hideez Key is up to **6 months**, depending on usage and the quality of the battery.
{% endhint %}

{% hint style="info" %}
Notice: if you don’t want to change the battery by yourself, you can contact any electronic service center that replaces watch batteries. 
{% endhint %}