Panasonic ST50T Operating Instructions Manual page 34

Replacing the battery
When the battery is running low, the indicator lamp flashes 5 times on turning the 3D Eyewear on.
In this case, early battery replacement is recommended.
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Dispose of the old batteries as non-burnable rubbish, or in line with the waste disposal regulations in your local area.
1
Loosen the screw and remove the cover using with a precision Phillips (No.0, plus +) screwdriver
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The screw is not removed from the cover.
2
Replace the battery
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If difficulty, remove it with the tip of the driver.
3
Replace and fasten the cover
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Use the specified type of battery (coin-shaped lithium
battery CR2025).
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Note the correct polarity (+ or -).
Push the cover firmly until it clicks
Tighten the screw
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