Panasonic FZ-G2 Series Operating Instructions Manual page 49

I M P ORTANT
Make sure the detach lock is securely locked, otherwise the battery pack may fall when you carry the computer.
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Do not remove the battery pack forcibly when the detach lock is locked. Doing so may damage the battery pack.
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During battery replacement, the LCD backlight may become dark.
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<Only for model with Built-in Bridge Battery>
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If the built-in bridge battery has not enough remaining power, you cannot replace the battery pack without turning
off the computer.
Turn off your computer before replacing the battery pack.