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Two voltage dividers circuit is used to monitor the voltages across the load resistance. A buzzer is used for giving different alerts. An OLED display is used to display the battery parameters.3 screw terminals are used for connecting battery and the load resistance. The design is very simple which is based on Arduino Nano. In the actual board, they are inside but in the schematic, they are lying outside. The only exceptions are the buzzer and OLED display. The positions of the components and wiring are similar to my actual board. To understand the schematic easily, I have drawn it on a perforated board also. Please do not attempt this if you are a novice. This tutorial was written for those who have knowledge of rechargeable lithium-ion technology. I cannot be held responsible for any loss of property, damage, or loss of life if it comes to that. Note: Please dispose of the bad batteries properly.ĭisclaimer: Please note that you are working with a Li-Ion battery which is highly explosive and dangerous. I hope this little tester will be useful, so I am sharing it with you all. But for the time being, I am happy with it. In the future, I will try to implement those things. The accuracy of the tester won’t be 100% perfect, but it does give reasonable results that can be used and compared with other batteries, so you can easily identify good cells in an old battery pack.ĭuring my work, I realized, that there are a lot of things that can be improved. This version is a really simple one, which is based on Ohms Law. If you enjoy my work here on Instructables, consider joining my Patreon, it will be a great help for me to make more interesting projects in the future.Ī few weeks ago, I have started the project from the basics. So I really wanted a way to measure each cell's exact capacity instead of their voltages.
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#Battery tester how to#
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