The PDA that never needs charged

This one is from my son. He got tired of a handheld machine that lost its battery charge too quickly because it held everything in ram. Not only that, but when it lost its charge, it also lost any data that wasn't backed up on the computer. He made, with duct tape, a "wallet" just the right size for 3x5 cards. (A small makeup case or pouch would work, too, or even a large change purse.) It allows for quick note taking, easy reading, and rearranging and disposal for convenience. And it never needs charged.