Introduction
Battery size ca. 53x34x6 mm, 3,7V, 1000-1200mAh
Tools
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            Open the Case carefully. Remove the plug and the battery. Perhaps it is clued a little bit. 
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            Replace the battery and plug it in. DONE. And vice versa. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.