> For the complete documentation index, see [llms.txt](https://help.waterwatch.io/3.0.1/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.waterwatch.io/3.0.1/hardware-and-maintenance/maintenance/upgrade-t35-to-t35-x.md).

# Upgrade T35 to T35-X

Once you have your T35-x kit, please read carefully and follow the instructions **step by step** to replace the battery and housing.

When you’re all done contact your supplier or email <info@waterwatch.io> and let us know. We will reset your battery level and record that you have completed the upgrade.

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Printable Instructions
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