I've had my SMP818 for several years, and I haven't been able to bring myself to sell it. However, I was hesitant to use it with a power adapter because I didn't want to be caught without power when I was out. I discovered that PDD has universal clip chargers, so I decided to make an external C-port charging accessory.
The necessary equipment includes: step-up module, soldering iron, solder wire, multimeter, hot glue gun, and glue sticks.
The reason for using hot glue is that it can be easily removed later using a heat gun if necessary.
I was able to easily find this type of power module online, and I eventually chose this one:
You can charge the battery end with a C port, and also power the high-voltage side after setting it to boost voltage. Once the high-voltage side is set to 8.4V, you can solder it on. This module lights up a red LED when charging, and turns on both red and blue LEDs when fully charged.
First, secure the position in advance and apply hot melt adhesive after welding. Then, use a heat gun to evenly heat the hot melt adhesive until it melts and covers everything uniformly. This completes the process.
The finished product is shown in the figure below:
This is a freshly manufactured battery pack that has not yet been evenly heated with hot melt adhesive:
The voltage at the positive output side is set to 8.4V, allowing for a slight error in the multimeter reading. The voltage at which the red and blue indicator lights stop charging is 8.37V:
Finally, here's the SMP818.（LT6100）Schematic diagram of the back electrode (please view the PPT diagrams):
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