Part 2 - Charger for 18650 batteries (Li-ion, 3.7V) with voltage regulator circuit

16,996 views

Hugo Max M. Teixeira

Published on Aug 2, 2020
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Keywords: 18650 Lithium Battery Charger 18650 Recycled Lithium Batteries In the video above I show you how to assemble a simple charger for 18650 Li-ion batteries using an old cell phone charger (5V power supply) and a small circuit made up of just 5 electronic components that can be found even in scrap yards. Cylindrical Li-ion batteries typically have a nominal voltage of 3.7V and a charging voltage of 4.2V. In other words, to recharge these batteries we need a stable voltage of 4.2V, and that is exactly what the electronic circuit I teach you how to assemble does. The circuit shown in the video regulates the output voltage to 4.2V and also helps control the maximum current that flows through the battery, thus preventing it from overheating and extending its useful life. This circuit was developed by me in the Proteus simulator. I also performed some tests with it and was able to prove its effectiveness in recharging the battery. You can recharge more than one battery at the same time by connecting them in parallel. But this can cause the TIP41 to overheat. To do this, I recommend installing a heat sink on the TIP. 0:20 How the circuit works 6:50 Simple diagram 9:40 Assembling the circuit on a PCB 9:12 Testing the project ---- Find out more: ---- Voltage divider: https://www.infopedia.pt/$divisor-de-... TL431: • TL431- Adjustable Shunt Voltage Regulator... - From the Electrolab channel

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