Convert an Atari 2600 joystick to a PSP battery pack

Some of you may be recoiling in horror at the thought of bastardizing your precious retro joystick. But those of you who dig on repurposing, our sister site Hackaday.com can show you how to make an external battery pack for your PlayStation Portable out of that old Atari 2600 controller. Full instructions are available and improvements for the next revision are welcome, so head on over and get in on the DIY action.