windows - Randomly execute 35 Batch files

I have 35 batch files in same folder. All batch files have different names and codes inside, i want to create batch file from where i can run 35 batch files randomly with out knowing their names or any characteristics. i created this batch file

@echo off
    :loop
    SETLOCAL ENABLEDELAYEDEXPANSION
    if exist "C:\Users\Administrator\Desktop\converted\*.bat" (
    for %%b in ("C:\Users\Administrator\Desktop\converted\*.bat") do (
    set /a n=!random! %%35+1
    start "" /w "C:\Users\Administrator\Desktop\!n!.bat" "%%b"
    ping -n 20 localhost >nul
    del "%%b"
    )
    )
    ping -n 60 localhost >nul
    goto :loop

but in this case i need to change all batch files name which is not recommended.looking for solution.