Another vector in the development of batteries is the combination of thin-film organic solar cell with a new type of polymer battery, which lets the battery charge itself with natural light. This works well on portable devices that one carries around as it can charge while it’s being used. Called flexible batteries
the technology combines polymers and fullerenes into an ultra-thin, low-weight package. This ensures the device can recharge at even low-levels of light.
Flexible batteries based on polymer technology have been around for some time. Japanese researchers
were showing off prototypes over two years ago.
Another technique uses nanocomposite materials carbon nanotubes
which can be embedded into sheets of paper.