Is there a way to build a flashlight spy cam?

I want to build one of these on the cheap.

I was wondering if I could mod a 4GB mini pen spy camcorder usb flash recorder in a flashlight.

I would also need to extend the battery life of the camera, because the camera would run out of battery before filling up the memory.

I would like it to turn on when I press the on button of the flashlight.

I also wonder if I could instead add several of them instead of having to mod the power and have a toggle switch and possible indicator when power goes out.

By the way I'll be using an led flashlight

Sandisk1duo8 years ago