XL4015

[Darum_Sevid]

Hey.

I bought a step down converter from aliexpress with battery charging function.
It has two potentiometers for setting a voltage and current at the output.
I wanna charging my li-ion battery ( 3.7V , 2200mAh ) with this.
Someone told me I should use diode at the output for preventing current backflow from the battery.
What exactly diode should i use ? What the connection should look like ? I am totally amateur in this matter. Pls help

[Vovk_Z]

Can you show what exact module did you buy? Possibly it doesn't need a diode at its output.
The diode has to withstand maximum charging current and about double output voltage. Shottky diode will be fine, e.g. MBR1060, MBR1645, or else.

[Darum_Sevid]

Dont know how to put a picture here but description says it is XL4015 buck converter , 5A max current. I want to charge only one battery 3.7V li-ion with i think 1A max

[ledtester]

If you are careful handling the battery you don't need the diode. The precautions include:

- Do not have a battery connected to an unpowered XL4015 module.
- Make sure the XL4015 voltage is always greater than the battery's voltage.
- Make sure the current limit is set before connecting the battery.

I want to charge only one battery 3.7V li-ion with i think 1A max

A cheaper and simpler solution in this case is a TP4056 module. You can easily find them on aliexpress/ebay/amazon.