> 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.md).

# Maintaining Your Sensor

- [Battery Replacement (all models after Oct 2022 except external antenna)](https://help.waterwatch.io/3.0.1/hardware-and-maintenance/maintenance/battery-replacement-all-models-after-oct-2022-except-external-antenna.md)
- [Battery Replacement - LS1R External Antenna (after October 2022)](https://help.waterwatch.io/3.0.1/hardware-and-maintenance/maintenance/battery-replacement-ls1r-external-antenna-after-october-2022.md)
- [T35 Battery Replacement (before Oct 2022)](https://help.waterwatch.io/3.0.1/hardware-and-maintenance/maintenance/t35-battery-replacement-before-oct-2022.md)
- [LS1R Battery Replacement (before Oct 2022)](https://help.waterwatch.io/3.0.1/hardware-and-maintenance/maintenance/ls1r-battery-replacement-before-oct-2022.md)
- [Upgrade LS1 to LS1R X](https://help.waterwatch.io/3.0.1/hardware-and-maintenance/maintenance/upgrade-ls1-to-ls1r-x.md)
- [Upgrade T35 to T35-X](https://help.waterwatch.io/3.0.1/hardware-and-maintenance/maintenance/upgrade-t35-to-t35-x.md)