Introduction: DIY BATTERY CAPACITY TESTER

By www.youtube.com/channel/UCY6KA8o
About: Electrical Engineer

Hello guys

I hed some old li-ion batteries. which is recycled from laptop batteries and powerbanks. i want to know what it's actual capacity. that's why i decided to make battery capacity tester.

this version can test li-ion batteries. stay connected for future version for such big updates...

this is based on atmega8 MCU.

I use 16x2 lcd to display parameters like voltage, current, capacity(mAh).

and i also use EXTERNAL voltage reference for good accuracy.

you can Watch video on YouTube: click here

Step 1: Parts and Components You Need...

this components you need:

  • ATMEGA8
  • 16Mhz crystal
  • 22pf capacitor
  • 10k resistors
  • 22k resistor
  • 470 ohm resistor
  • bc547 transistor
  • lm1117-adj regulator
  • 10k preset
  • 1k preset
  • 5v relay
  • 104j (0.1uf) capacitor
  • 10uf capacitor
  • 16x2 lcd display
  • tl431 voltage reference
  • 2.2k resistor
  • 5v buzzer
  • 1n4007 diode
  • LM358
  • IRLZ44 (or logic level MOSFET);
  • 1ohm 5W shunt resistor
  • PCB
  • micro usb socket(female)

Step 2: Circuit Diagram

this here is the circuit diagram:

make all connection according to diagram

Step 3: Upload the Code

you can use any arduino in this project i use atmega8

for code: click here

Step 4: Let's Use It...

i tested it and it works perfect.

i measure current and voltage in multimeter also

this is the readings

battery tester

v: 4.03

current: 0.70

multimeter readings:

v: 4.07

current: 0.74

overall this is very good.

thanks

make it and share your experience. if you have any query feel free to comment it.