DIY: Bluetooth Headphone Jack Upgrade

Many smartphones these days lack a dedicated headphone jack, and Bluetooth headphones often don't have enough battery life, typically lasting only about 7 hours of continuous use. So, what can be done? One possible solution is to modify Bluetooth headphones by upgrading the battery and adding a 3.5mm headphone jack to use existing wired headphones.

Start by getting the mainboard of a disassembled Bluetooth headphone.

Next, prepare a 3.5mm audio connector. For those with basic skills, you can create simple diagrams based on online tutorials. Make sure to perform a virtual assembly first to catch any potential errors before printing.

You'll need an I3 acrylic 3D printer, modify the power supply, and use a 0.2mm nozzle.

If the printing results aren't satisfactory, you can manually correct them. After printing, proceed with the assembly.

The battery used is an 08570 lithium battery, each with approximately 300mAh capacity. You'll need two of these.

Here's what the completed assembly looks like:

After assembly, lightly sand the edges with sandpaper.

After testing, even after more than 24 hours of use, the computer still showed 70% battery remaining. The power is sufficient, and it could easily last several days before needing to be recharged.

In conclusion, if you're thinking about changing the charging port to a Type-C and sharing a cable with your smartphone, considering the size and the difficulty of assembly and drawing, this modification might not be very practical.