Open Noesis, and navigate to the directory you want to batch convert. (For this purpose, it is the "gibs" directory)
On the top menu bar of Noesis, choose Tools -> Batch Process.
From there, set the output extension, and any extra parameters ( -flipUV is a common one).
Now click on "Folder Batch", and choose the folder that contains all your models.
After choosing your folder, the list should populate with commands for each model in that folder.
Hit okay and let it fly! It will pop up a message when it finishes.
Close the batch converter, and all your models should now be in the format you specified!