All Bigblue dive lights come with replaceable batteries and battery packs. Inspect batteries for corrosion or other damage. To replace the battery, unscrew the body and remove the old battery, insert the charged one ensuring it is seated in the proper position so that all connections are tight. Most Bigblue lights require that the battery compartment be screwed tightly onto the light head, assure that salt build-up within the threads is not impeding a tight connection.
Make sure your battery is charged. If you have access to an identical Bigblue battery, try that battery in the light. If your light still does not turn on, please contact us to establish a return authorization request.
For more information about using our batteries, read our Battery Usage Guide.