# Maintenance and Troubleshooting

{% content-ref url="maintenance-and-troubleshooting/battery-replacement" %}
[battery-replacement](https://manual.kardi.ai/en/maintenance-and-troubleshooting/battery-replacement)
{% endcontent-ref %}

{% content-ref url="maintenance-and-troubleshooting/chest-strap-maintenance" %}
[chest-strap-maintenance](https://manual.kardi.ai/en/maintenance-and-troubleshooting/chest-strap-maintenance)
{% endcontent-ref %}

{% content-ref url="maintenance-and-troubleshooting/changing-the-kardi-ai-app-language" %}
[changing-the-kardi-ai-app-language](https://manual.kardi.ai/en/maintenance-and-troubleshooting/changing-the-kardi-ai-app-language)
{% endcontent-ref %}

{% content-ref url="maintenance-and-troubleshooting/sending-application-logs" %}
[sending-application-logs](https://manual.kardi.ai/en/maintenance-and-troubleshooting/sending-application-logs)
{% endcontent-ref %}

{% content-ref url="maintenance-and-troubleshooting/restart-kardiai" %}
[restart-kardiai](https://manual.kardi.ai/en/maintenance-and-troubleshooting/restart-kardiai)
{% endcontent-ref %}

***

{% hint style="success" %}
**Need help?**\
Contact Kardi Ai customer support\
☎️ [**+420 779 998 100**](tel:+420779998100)\
✉️ [**support@kardi.ai**](mailto:support@kardi.ai)
{% endhint %}