There are two necessary evils that we despise about gadgets: the need for batteries, and the need for cables. LG Chem has now come up with a way to combine both cables and batteries into one thing (a "batterble," if you will) that's a full 50% less evil. It's not quite good, but it's way better than what we've got now.
Making a long and flexible battery is really just the next
evolutionary intelligently designed step after making a flat and flexible battery, something that we've had for a while now. You can take the same basic idea and twist it up, and you get a flexible cable that can store energy. Specifically, LG is using thin strands of copper wire coated in nickel-tin alloy as an anode, wrapping them in aluminium wire coated in lithium cobalt oxide as a cathode, pouring liquid electrolyte down the middle, and then covering the whole thing in an insulator to make a long flexible batterble that's only a few millimeters thick.
These batterbles (I'm sticking with the name, dammit) may be just prototypes, but they can output the same voltage as the battery in your smartphone with a comparable energy density, and LG has apparently used a knotted 25 centimeter length to power an iPod Shuffle for ten hours straight. LG says that you can expect to have this tech on the market by 2017, at which point we're all going to start knitting ourselves ugly sweaters that double as power packs.