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Project Notes

#518 Lipo Tester Module

Just a quick look at a 1S to 8S battery tester and alarm module.



I picked up a 1-8S voltage monitor and alarm from an aliexpress seller

  • for 1-8s Lipo/Li-ion/LiMn/Li-Fe
  • Voltage detection pricision: 0.01V.
  • Unit voltage display range: 0.5V-4.5V.
  • Total voltage display range: 0.5V-36V.
  • 1S test mode voltage range: 3.7v-30v.
  • Low voltage alarm mode for 2-8S.
  • Alarm set value range: OFF-2.7V-3.8V, preset value 3.3V. Pushbutton (top) can change the voltage settings and save.
  • When the voltage is below the set value, it will buzzer with red LED light.




Taking a closer look but cutting off the heat-shrink protector. I found the 3-digit LED display also still had it’s protective plastic attached (which I took the opportuntiy to remove).


It seems power is tapped from the 1S unit to drive the alarm, and voltage dividers are used to scale the voltage of each battery cell to a level that can be read by a microprocessor’s ADC.


I haven’t desoldered the LED display (yet), but if I did it looks like I’ll find a PIC or other brand of microprocessor underneath..


Credits and References

Project Source on GitHub Project Gallery Return to the LEAP Catalog

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. Two main themes have emerged in recent years, sometimes combined:

  • electronics - 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
  • scale modelling - I caught the bug after deciding to build a Harrier during covid to demonstrate an electronic jet engine simulation. Let the fun begin..
To be honest, I haven't quite figured out if these two interests belong in the same GitHub repo or not. But for now - they are all here!

Projects are often inspired by things found wild on the net, or ideas from the many great electronics and scale modelling podcasts and YouTube channels. Feel free to borrow liberally, and if you spot any issues do let me know (or send a PR!). See the individual projects for credits where due.