How to install the battery for 2017.09 mb star c4 diagnostic tool

Mercedes Benz Diagnostic Scanner mb star c4 newest version is 2017.09 , support WIFI,  do you know how to install mb star c4 batteries ? Here is the steps help you solve the battery installation problems.
1. Please prepare the following tools:

①— MB Star C4 multiplexer which need to input the batteries。
②— 6 units Ni-MH Rechargeable batteries，Size：AA， Voltage：1.2V，
Capacity：above 1700mA。
③— 1 unit 108M WIFI Card。
④— Plum screwdriver，Specification：T-20
2.Take out the rubber from sd connect c4 firmware :
2.1 Use the T20 Plum screwdriver to take out the screws as below.

2.2 Take out the rubber as below.

①— Batteries Space.
②— WIFI Card Space. ③— SD Card Space.
3. Insert the Rechargeable batteries.
3.1 Use the T20 Plum screwdriver to take out the screws of Batteries Space fixation as below.

3.2 Take out the fixation of Batteries Space. Pay attention to the Battery polarity marked in the Batteries Space.

3.3 Insert the sd connect c4 battery. Note the Battery polarity.

3.4 Button on the Fixation of Batteries Space after inputting the Rechargeable batteries.

3.5 Use the T20 Plum screwdriver to fix the screws of Batteries Space fixation as below. Inserting the batteries is finished for MB SD Connect C4/C5.