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Mobile phones have rechargeable batteries to provide them the power they need for functioning.  A rechargeable battery is a group of one or more secondary cells, just like laptops have more batteries, but they are often called "battery", in singular form. This kind batteries can be restored to full or partial charge by the application of electrical energy, through a device, like a charger.Rechargeable batteries have a higher initial acquisition cost, but the main advantage is that they can be used more than once, like normal batteries.

Rechargeable batteries come in many varieties, but the most well known types are Nickel Cadmium Battery (NiCd), Nickel-Metal Hydride Battery (NiMH),  Lithium-ion Battery. In 2007, professor Yi Cui and his colleagues from Department of Materials Science and Engineering at Stanford University's developed the classical system of the batteries and concluded that using silicon nanowires gave rechargeable Li-Ion batteries 10 times more charge than normal wiring.

Samsung's researchers developed a water based battery and the company hopes to bring it on the market in 2010. This is a very important step in mobile phone industry because it brings into attention and in normal usage, an innovative method for supplying power to mobile phones. This Samsung battery converts water into Hydrogen and Oxygen gas, and the Hydrogen reacts with the metal inside the battery when the phone is switched on, and this mix provides the power needed for the mobile phone to function properly. This Samsung battery can generate up to three watts of power electricity, and the battery can last up to 10 hours, twice as long as rechargeable batteries. If it is used four hours a day, the Hydrogen cartridge must be changed every five days,and this is an expensive solution for mobile phones, but Samsung hopes to improve the system and their goal is to improve the battery, and it might require only filling it with water.

Some researchers don't agree the new idea of water based battery because they say that in the chemical reaction produced inside the battery, there is a highly flammable gas emission and that might produce damages to users. But the main advantage of this samsung battery is that it comes on the market as a "green" solution, not affecting the environment as the normal rechargeable batteries do. Many companies in mobile phone industry, as in many other fields are looking for cheaper, and more environment-friendly solutions.

This innovation has been presented at Korea Electronics Show in 2007, and we are faster and faster getting closer to 2010. We will see in the next year first mobile phones which have water based batteries. The only way to evaluate their batteries' efficiency is to buy and try the phones with this kind of batteries, and then review the revolutionary system. It would be interesting to see if it is a successful solution and if Samsung battery can be extended to other industries too. Applying this innovation to mobile phones would be the first step in a revolution, because water based batteries would be a great alternative to the conventional fuels.