Introduction
If the charger-contact is defect (= no charging LED), or battery has never charged : read this other guide to check the electric connection
What you need
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Carefully lever off the knob with a small knife.
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To reassemble: This small hook should be in that hole.
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Take care, to no lose this little part.
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use a stub knife (like the stub side of a butter knife). Be careful.
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Your hear a "blob" sound, when a locking is open.
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There are two hocks on each side, which has hold the outer cap. These may help you to lever up. But stay careful.
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An image of the two inner locks.
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use a pliers to pull it out
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Do not lose this little plastic part.
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just image, and some technical data (incl. power supply polarity).
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Ask FixBot
Conclusion
To reassemble your device, follow these instructions in reverse order.
