Daizi Zheng, a student at Central Saint Martins, came up with the concept whilst studying for her final year project.

The prototype is said to run for up to four times longer than a traditional lithium battery and has the potential to be fully biodegradable.

The battery works by using enzymes to catalyse sugar in the drink. This in turn releases electricity which powers the mobile phone. As the battery dies, just water and oxygen remain.

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Sony Ericsson claim that the new phones reduce the carbon footprint of mobile phones by around 15%. Both phones also come with an application that allows owners to calculate the greenhouse gas emissions they will save by walking instead of taking the car.

The mobile phone pairing are part of Sony Ericsson’s green hopes, one of which includes attempting to cut the company’s CO 2 emissions by 20% by 2015.

Both the Naite and the GreenHeart C901 are expected to go on sale later this year. The company is hoping that their eco-friendly mobile phones will mean they become a leader in sustainability in the mobile phone industry.

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