These devices use a microcurrent to gently push a drug into the patients skin for faster healing or cosmetic improvements, making a small, thin and flexible battery a necessity.

FORBES: Enfucell Makes Batteries Thin, Green And Printable

The team of Professor Keon Jae Lee from the Department of Materials Science and Engineering, KAIST has developed a high performance flexible all-solid-state battery, an essential energy source for flexible displays (see paper in Nano Letters: "Bendable Inorganic Thin-Film Battery for Fully Flexible Electronic Systems").

ENGADGET: Korean scientists solve flexible battery riddle (video)

Created out of traditional beads and thread and powered by a flexible lithium battery, the LED bracelets combine a variety of functions.

CNN: You wear IT well

The company has created a slim bracelet, the UP band, that contains a wealth of sensors and a rechargeable battery all attached to a flexible steel frame enclosed in a special, rubber-like coating.

ECONOMIST: Technology will become even more personal

In a sense, the battery is a latecomer to the push toward flexible, stretchable electronics.

BBC: Stretchy battery drawn to three times its size

To have a fully flexible finished product, both parts of the display have to be flexible - the optical frontplane and the backplane, where transistors are - as well as the device's battery, the outer shell, the touchscreen and other components.

BBC: Bend me, shape me: Flexible phones 'out by 2013'