Additional external battery from internal for Segway Ninebot ES1/ES2/ES4

Hi, I was recently disassembling a friend's scooter and saw the controller, and I got an idea :)
A little bit of internet, a little bit of money and a built-in battery from another scooter brought it back to life.

You will need:
XT30 (male and female)

cable 22 AWG and 16 AWG (about 8 centimeters each).

Ideally, use a connector like this

External battery connector (for example)

or use 3d model (3DCuts)

but i just took 2 xt30 (male and female) and the original terminals from the battery data connector

M3 embedded nut:

11 pcs.

M3 bolt 20 mm:

11 pcs.

M4 bolt 20 mm:

2 pcs.

Connection principle (Borrowed from mveplus on GitHub):

to connect and save the charging port, extend the cable 

 test connection,

to check for charging