Sooner or later, everyone changes their mobile phone. This does not always happen due to the obsolescence of the model. Often, citizens are forced to take brand new devices due to the breakdown of old ones. In this case, numerous components remain from a phone that has served for many years. Including batteries. Don't rush and throw them away. Such batteries can be used with benefit in the household.
Each cell phone rechargeable battery is equipped with a very valuable part - an integrated charging controller. In fact, for a person savvy in electronics, this element is a true treasure. However, even beginners can use it for the benefit of the economy. The mentioned element maintains the voltage, monitors the charge level, protects the battery from short circuits, and monitors the temperature. The thing is useful, but first you need to remove it ...
You can use the controller to create your own charger. We'll have to get some brand new lithium-ion batteries on the market. Best taken from the 18 650 series. The controller itself removes quite simply: we take the battery, carefully cut the retaining lamellas using pliers, and then use a screwdriver to pick out the plate of interest to us.
After removing the charging controller, we find the connections "B +" and "B-" on it. We weld the corresponding wires to them. On the reverse side there will be 2-3 battery outputs. We also weld wires to them and connect them to batteries. If there are several batteries, then we also weld them together. It is necessary to assemble the structure in such a way that the controller closes the circuit. As a result, we get the simplest energy bank for personal needs.
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Continuing the topic, read about creative inventions, which you will probably want to try in practice.
A source: https://novate.ru/blogs/270321/58338/
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