DIY LiFePO4 Battery Charger with Adjustable Power Supply

If you're interested in DIY lithium iron phosphate (LiFePO4) battery chargers, this article might be just what you're looking for.

You'll need to gather some 5# LiFePO4 batteries and an adjustable power supply to make your own charger.

The adjustable power supply is shown in the image above, which is quite suitable for making a charger.

Here's the design for the box:

For materials, you can use copper-clad boards, preferably the photo-sensitive kind. The one used here is 1.6mm thick, about 200x200mm in size.

Assembling the components: what needs to be assembled, get it together; what needs to be soldered, solder the wires.

This is what it looks like once assembled.

For the battery's positive terminal, just screw it directly in. This is the 5# battery slot; the one next to it is for the 7# battery.

For the battery's negative terminal, use a spring-loaded one, again secured with screws.

For the input port, it's a 5.5-2.1mm connector. If you don't have a fixed nut, you can temporarily use a zip tie to secure it.

Charging alone is a bit of a waste—you can also add an output port to turn it into an adjustable power supply.

Output port 1 uses a metal terminal block.

Output port 2 uses a 5.5-2.1mm connector.

And that's it—mission accomplished!