Uploaded July 2020 | Updated September 2026, 2 weeks ago

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This is a bluetooth adapter which had a dead battery so I connected it to a power bank battery. This is connected directly to the 3.7v 18650 cell inside the power bank. I added a switch to charge because before the circuit was getting warmer than normal. The runtime is a lot longer than the 8 hours by the original battery. This syncs to my phone and has a little more bass than just using the phone to amp to headphones route. I hope you enjoy the video and thanks for watching.