These days Bluetooth-based gadgets are everywhere, including for car and solar batteries. After connecting them up to the battery, you download the accompanying app on your smartphone, open it up ...

(To learn more about how we choose these Bluetooth speakers, check out the "How we tested" section). Testing the JBL Charge 5 side by side with the Charge 3. Credit: RJ Andersen / Mashable ...

We’re pleased then to see the work of [ElectroBoy], who has combined something of both approaches by reverse engineering the pinout of a Chinese Bluetooth ... traces on one side with the other ...