Your next smartwatch could be charged by your own body.......

Battery life is one of the biggest concern but that might have just found the solution.

Researchers at the Korea Advanced Institute of Science and Technology have created a small flexible patch that converts body heat into electricity which could be used to power a wearable device.
The ability to generate power in this way is handy anyway, but the added flexibility here means it would be perfect for smartwatches and fitness bands.
It's unclear whether this could make charging redundant completely or just help extent the battery life a bit - but we'll take anything right now.