In this video how to make a 3.7v Li-Ion 18650 Battery charger using LM2596 DC-DC buck converter step-down power module. 18650 Battery Maximum charger voltage should be 4.0v o 4.2v DC
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Download Circuit diagram and detail –

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the component is using
1) 3.7v Li-Ion 18650 Battery
2) LM2596 dc-dc buck converter step down module

buy material by the following a link

3.7v Li-Ion 18650 Battery =
LM2596 dc-dc buck converter step down module -=
MT3608 2A dc-dc Step Up Boost Power Module =

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Click the link see the more videos on the playlist

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buy more material by the following a link
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2. 1N4007 Mic 1A 1000V DO-41 Rectifier Diode Set Of 10 =

3. DC 0.9V-5V 0.6A USB Charger power bank Module
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11. 1W High Power Led Lamp 110-120Lm LEDs =
12. 12 Volt DC Motor (Multipurpose Brushed Motor For DIY Applications PCB Drill) =
13. DC 12v gear motor =
14. Electric Hand Drill PCB Press Drilling 12V Motor, 12000 RPM, 10 Pcs 0.3-3.0 mm Drill Bits Set, Keyless Brass Chucks and Hi-Watt Battery =
15. 12V PCB MOUNT SUGAR CUBE RELAY =
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29 thoughts on “3.7v Li-Ion 18650 Battery charger using LM2596 DC-DC buck converter | single battery”

  • Better have a fire extinguisher ready. Also, lipos don't like to be charged to 100%. It kills its life span. charge it to 3.8-4.0v

  • Duncan Haskell says:

    I can see the negative comments left by people who dont understand the basics of how batteries work, this is a good system. When the battery reaches 4.2v no more current will flow. Why would it as there is no potential difference? If you wanted to reduce the initial current you could connect a resistor to the output. These little DC-DC converters dont push out much current anyway, nothings going to blow up..

  • Rusty J. Ryan says:

    I think if i set up the voltage at 3.9v it'll more save.. coz 3.9v is stil in range the capacity of 18650 battery..so i think it not dangerous at all.. even if i forget to turn off the adaptor.. remember that there is no way current will flow if the battery and charger has a same state of voltage..

  • PLEASE PEOPLE, DON'T FOLLOW THIS AT ALL!!!

    A 18650 (pink) needs to be charged at 4.2 volts, 1428mA for a MAXIMUM of 2 hours.
    This must be constant voltage and constant current.

    There are better bucks out there that control voltage AND current as well as have a volt sensor with auto cutoff.
    You can add an Arduino to a kit like that to monitor the "discharged" voltage, the "charging" voltage, the "charged" voltage as well as time of charge cycle.
    With Arduino, you can actually add a temperature sensor as well and tape it to the battery(ies) and if a certain temperature is hit, then it would shut everything down.

  • bass boosted says:

    You charge the battery to 4.2 v is not overcharghing and you can conect at 5v 1amp charger to charge at 4.2v with 1amp

  • Andrey Isupov says:

    Аккумулятор долго не прослужит. Главное правило зарядки емкость АКБ / 2 = ток зарядки.

  • this video is dangerous and misleading people DO NOT DO THIS PEOPLE go and buy the correct charger ( you can blow the battery very easy )

  • I tried it for recharge battery but the led discharging it I put one diode between battery and this buck board then the led started blinking the output voltage fluctuating can anyone suggest a solution

  • My battery pack is totally 4 18650 battery’s connected 2 each parallel and series I having one 12v 1.2a charger I used 7808 regulated Ic with a shut resistor of 5w try to charge but the 7808 going too hot within seconds can anyone help me to solve this problem

  • David Elias Pedroza Chamorro says:

    you can not control the current and your battery is fake. If you do not have the necessary knowledge, you should not do this kind of videos

  • Mohammed Riad says:

    i have a buck converter like this, but i reversed polarity and it won't work anymore is there any solution to fix it??????

  • Vinaya Bhandari says:

    In this module there are two resistor .one is potentiometer i.e 103 means 10k ohm .what is the code of another resistor

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