Prepare the tools
Soldering iron, solder, rosin and some wires. The price of these tools is not very high, you can buy them all for around twenty yuan. If you are interested and know something about electronics, you can purchase a multimeter.
Some lithium batteries cannot be charged, which does not mean they are broken. As long as the battery does not rise, it can still be used. Simply remove the lithium battery protection plate.
Use used lithium batteries to make mobile power supplies.
The voltage of the lithium battery is 3.7V. With the boost module, the voltage of 3.7V can be increased to 5V to charge the mobile phone. If there are enough lithium batteries, you can connect several more in parallel for use. (The booster module can be purchased on Taobao. You need to buy one with booster functioncharge. It is more difficult to charge the booster function alone. The price ranges from 6 to 30 yuan.)
You can change the ordinary USB speaker to mobile speakers.
The voltage range supported by USB speakers is usually around 3 to 6 V. You can solder a cell phone battery to the wires and then solder them to the stereo. As long as the positive and negative power supplies are connected correctly, the red of the USB cable is generally positive and the black is negative. Just move the speaker like this.
You can turn the regular USB fan into a removable USB fan.
The method is as above
The steps to disassemble the lithium battery from the module are:
1 Remove the PVC cover : there is adhesive. between the PVC and the outer metal aluminum shell Gel.
2. Remove the top and bottom polymer covers, then remove the coversSpot-welded metal aluminum keys.
3. Separate the battery core and the metal case: the liquid electrolyte can be observed from the electrode surface.
4. Remove the battery core: the remaining positive electrode material, the negative electrode material, and the separator.