I saw this circuit at Facebook at https://www.facebook.com/share/p/1AC9zDA8gR/
I hv been seeing circuits like this i will be wondering what a hell are they publishing like this without shame !
Dangerous, do not use !
This is what I call an “automatic house ingnitor circuit”
Lithium battery exploder circuit
That looks like a one way ticket to frying your USB controller, and a Lithium battery that may burst in to flames.
No over voltage protection, no Over-current protection, the only resistor is on the LED. That is an express way to burning someones house down.
I would not recommend this circuit. The USB 3.0 interface will supply 5V. There will be a 0.7 V drop across the diode, so you will be trying to charge the 3.7 V Lithium battery with 4.3 V. The Voltage to charge the battery should not exceed 4.2 V. I recommend you use a proper BMS to control the charging of the battery. The USB voltage can go higher than exactly 5V, as the USB voltage range varies, with traditional standards being around 5V but with a range of approximately 4.4V to 5.25V.
A lithium-ion battery can explode or catch fire due to a phenomenon called thermal runaway, which is a dangerous, self-perpetuating chain reaction that causes a rapid increase in temperature. This is most often caused by internal short circuits from manufacturing defects or damage, overcharging, or exposure to high temperatures. While a full explosion is possible, more often it results in the battery venting hot gases and flames through a safety valve.
Video: Here’s what happens when a lithium ion battery explodes
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