The corresponding place of diode on motherboard is shown below:
Note: after removing the diode, it is impossible to download program to motherboard by inserting USB, as you switch it off.
Use wire to connect “+” pole of lithium battery to 5V of motherboard, “-” pole to GND of motherboard, as shown below:
After that, weld lithium battery to charging module. Use diagonal cutting pliers to cut PH2.0 interface on lithium battery, and weld it to charging module. Note to connect red to “+” pole and black to “-” pole. If not, you know it will be unsuccessful. See the following picture: