Designer Daizi Zheng has designed the Coke Phone. This is an eco friendly phone for Nokia, which runs on Coca-Cola drinks or any sugary water.
This phone’s fuel cells generates electricity from carbohydrates(sugar)
The bio battery in the phone generates electricity from carbohydrates (currently sugar) and utilizes enzymes as the catalyst. So it only needs a pack of sugary drink and it generates water and oxygen while the battery dies out. Bio batteries have  the potential to operate three to four times longer on a single charge than conventional lithium batteries and it could be fully biodegradable.
This is coke that gives back..to the environment.