DIY battery discharger and capacity tester for Nickel metal hydride battery using Arduino

[@prastawaadiwierjotenojo593]

hello. thanks for the tutorial. what a nice project. btw, what changes do I need to make it drop faster? [i use fujitsu ni-mh 900mah]

[@oktavianusgalih2639]

Hi Thanks for sharing the project, your project are awesome. But I have problem, why my screen just white? can you help me? thank you

[@yupingliao4078]

喔！我頭一次看到你做的測量電池放電曲線圖打印在TFT屏幕顯示，這個項目真的很不錯👍，請問：如果想要測量更高12V以上，是不是要用分壓電阻給模組

[@fusion747pc]

Thank you watching my video. As you would expect, this device cannot measure 12V. The device uses a 1 ohm resistor as the load, and the current that flows when using a 1.2 volt NiMH battery is calculated to be 1.2 amps. This power is 1.44 watts, and this resistor is 3 watts, so it can withstand. On the other hand, at 12V, the current is 12 amps and the power is 144 watts. This will burn the resistor. Moreover, the screen display does not support such high voltages. Therefore, as you say, you need to lower the voltage by means such as voltage division . It may be possible to measure by lowering it to about 1.2V, but since I have never done it, it is not a guarantee.

[@yupingliao4078]

@@fusion747pc 工程師你好，好的，我了解了，謝謝你回覆指教👍

[@rioferzz]

Sir, i want to measure 12V battery. what if i'm using bulbs / fan instead of big resistor for the load? is it causing any error in measurements? thanks

[@HAKOoooo]

Hi. Nice project.. What changes do I need to make to test 18650 batteries?

[@fusion747pc]

Thanks for your question. The 18650 battery is a lithium-ion battery with a high voltage of 3.7V, so the 1 ohm resistor connected to this device will cause too much current. Therefore, you can change to a 3 to 4 ohm resistor and reduce the current to about 1 amp. Also, resistors should use around 10 watts. Then I think you have to the cutoff voltage 0.95V to appropriate voltage such as 3.0V in the sketch. I haven't tried it, but I think you can make measurements with this device by making that change.

[@yulianto.ganjar]

Can i make multiple slot batteries with this project?