RocketFish RF-RBWS02 User Manual page 16

To replace the battery:
Press the battery tray lock to the right, then slide out the battery tray. You
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can remove the battery door with your fingernails by using the spaces
set back in the remote control.
Match the polarity on the lithium cell with a plus sign (+) on the battery
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tray.
Replace the battery with a CR2025 or equivalent.
Slide the tray with the new battery into the battery compartment until it
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clicks into place.
Warnings:
Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type of battery.
Notes:
Remove the battery from the remote control when it is not to be used for a long
period. Otherwise it might be damaged due to battery leakage.
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