DIY BATTERY CAPACITY TESTER

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

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)

this here is the circuit diagram:

make all connection according to diagram

you can use any arduino in this project i use atmega8

for code: click here

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.