This is a basic shell for the PSP Go battery shell that can be screwed shut. This is designed to fit a PSP go and it's a very tight fit. The battery shell can be removed from the PSP and doesn't cause a buldge.
However I was only able to source a 800mAh battery which can fit within the small space in the PSP Go. There maybe bigger batteries for the PSP Go since it was originally sold with a 900mAh battery
The author marked this model as their own original creation.