Einleitung
Most common issue with this is the difficulty with which to open it up.
Werkzeuge
Ersatzteile
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Remove the brush head
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Using a thin screwdriver carefully pry open the bottom of the case.
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Remove lower cap (2 plastic tabs). O-ring is already removed in this picture.
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Here are the solder connections of the battery: + (red) and - (yellow).
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Unwrap the battery and replace it (see Soldering Skills).
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To avoid a short circuit (the battery will normally still have a remaining charge), start at the positive pole of the battery and unsolder completely from the board.
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Continue with the negative pole.
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At the end, loosen the soldering pads from remaining solder, so that the contacts of the new battery can be inserted into the board.
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Solder teh positive and negative pole.
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Requires a 3.7V battery, which is approximately 14mm x 49mm (similar to AA).
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Before assembly, check the upper seal and the lower O-ring and replace those if necessary.
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
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