Scrap-n-Repair: Bluetooth Headset Battery Replacement 

Found this unit in the trash. Bluetooth Headset. Does not charge and power on. Battery replacement fixed the issue.
Tools and parts required:
1. Screwdriver
2. Soldering iron
3. Electrical tape
4. 3.7V-LiPo-Battery (Lithium-Polymer) (shopee.com.my/...)
Disclaimer: Perform this repair at your own risk touching any internal parts can cause an electric shock