Introduction
The Otium Bluetooth Headphones are rated for 500 charge cycles. If your headphones will not hold charge, or charge at all, you may need to replace the battery.
Tools
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            Carefully remove the battery from the housing. 
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            Shown is a 3.7v 100mAh Lithium Polymer (LiPo) battery. 
 
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            Carefully peel back the rubber cover from the protection circuit module (PCM). 
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            Remove the cover and save to re-use. 
 
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            Use a soldering iron to desolder the two wires from the PCM. 
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            Adding a JST connector would make future repairs much easier! 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.