The Orbiloc Service Kit contains everything you need to maintain your Orbiloc Safety Light.
The Orbiloc Safety Lights use two CR-2032 Lithium batteries. A pre-wrapped battery pack of two cells comes with all Orbiloc Safety Light models.
The Orbiloc Safety Light has a very long battery life: 250 hours when flashing and 100 hours when steady-on.
The tiny O-ring lubricated with silicone is crucial to the Orbiloc Safety Lights remaining waterproof to 100 meters.
To make sure the Orbiloc Safety Light stays waterproof we recommend the O-ring be replaced every time you replace the battery pack.
Here is a quick and useful video with instructions on how to change the battery.
https://www.youtube.com/watch?v=gTee3dooz6c
Or you can read the user manual.