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NOTICE
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For devices without screws on the bottom side of the device (model dependent):
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Completely discharge the battery (leave the unit switched on with no power supply until it automatically switches off).
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Lever off the front cover using a flat-headed screw driver (placed between the display and display frame).
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Remove the 5 screws.
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You can now lever off the front of the device from the back panel using a flat-headed screw driver.
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Then remove the circuit board; to do this, you first have to remove the screws of the circuit board.
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Disconnect the plug of the battery connection cable.
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Remove the battery.
Note:
Do not reconnect a unit that you have opened to the power supply.