Panasonic FZ-M1 Series Operating Instructions - Reference Manual page 32

To insert
Close the battery pack until it touch to the secured position.
Be careful about the battery pack direction.
In case that the projection does not match the dents of the computer, detach the battery pack once, then slide it while pushing it lightly to avoid floating.
Make sure the latch 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 latches are locked. Doing so may damage the battery pack.
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<Only for model with Built-in Bridge Battery>
If the built-in bridge battery has not enough remaining power, you cannot replace the battery pack without turning off the computer.
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Turn off your computer before replacing the battery pack.
Do not leave the computer in sleep mode with its battery pack removed for 3 minutes or longer.
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Do not bring magnets or objects with strong magnetic fields near the computer. Doing so may result in the computer erroneously detecting the
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battery pack as removed.
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