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Project Notes

#544 ShengYang 18650 Battery Shield

Checking out the ShengYang 18650 Battery Shield V3 - single cell with USB charge controller and three regulated outputs - 3V, 5V and switchable USB Type A.



I purchased my unit from a seller on aliexpress.


  • charging:
    • micro USB input
    • 0.5A current charging
    • 5-8V Input Voltage
    • LED indicators:
      • Green: full (L1)
      • Red: charging (L2)
  • battery protection:
    • Over charge
    • Over discharge)
  • output:
    • Type-A USB Output (with switch)
    • 3V 1A (3 sets of connection pads)
    • 5V 2A(3 sets of connection pads)
  • board Size: 9.8x2.9cm/3.86x1.14inch


Core components:

  • TP4056 constant-current/constant-voltage charge controller
  • FP6298 Low-Noise 4.5A Step-Up Current Mode PWM Converter



Charging is vie the micro USB marked “Input” (5V).


LED Meaning
L1 (green) Charged
L2 (red ) Charging





Measuring 3.2V and 5V output:


Credits and References

About LEAP#544 PowerBMS
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This page is a web-friendly rendering of my project notes shared in the LEAP GitHub repository.

LEAP is just my personal collection of projects, usually involving an Arduino or other microprocessor in one way or another. Some are full-blown projects, while many are trivial breadboard experiments, intended to learn and explore something interesting (IMHO!).

The projects are usually inspired by things found wild on the net, or ideas from the sources such as:

Feel free to borrow liberally, and if you spot any issues do let me know. See the individual projects for credits where due. There are even now a few projects contributed by others - send your own over in a pull request if you would also like to add to this collection.