12v Lithium 18650 Power Bank, HX-3S-01 Protection Board

This device can be used as power bank and as 18650 Lithium Polymer battery cell charger.

HX-3S-01 Protection Board needs 12V power source to be turned on. I used 12V DC Power adapter. This can be used as charger for the power bank. I specially chose HX-3S-01 board because it can be charged with 12 V which is pretty common.

18650 3S Battery holder 1x

18650 Battery Cells 3x

HX-3S-01 Battery protection/charging board

12V DC power supply/adapter

Some wires

Soldering iron

Tape

Solder/Solder paste

Scissors

Now strip 2 wires and connect them to battery holder where the battery + and - goes together. Basically to the each metallic bit with spring. This is for B1 and B2 terminals to be connected. These are for balanced charging/discharging 3 cells at once.

The battery holder is connected in series. Just like the instruction shows by how to connect it.

First we will start with B+ in my case the wire is RED, goes to B+
Next B- Black wire goes to B-

Solder B1 and B2

Insulate with tape

To turn on the HX-3S-01 protection board you will need to connect it to a 12V DC power source. I used NETGEAR 12V adapter. On its label can determine which polarity is the plug terminal. When this done, try to connect the power in/out wires to it. Polarity is important as we are dealing with DC here.

To test the board if its working and turned on you will need electronic voltmeter. When connected and meter set to DC voltage measurement it should read just a bit more than 12V.