MojoKid writes: Since the original iPhone was released in 2007, we have seen some incredible advances in smartphone processing power along with a wealth of feature improvements like faster Wi-Fi and cellular speeds and larger, higher resolution displays. However, battery technology, for the most part, hasn't kept up. There are a few major battery suppliers but Sony is currently an underdog, commanding just 8 percent of the market for compact lithium-ion batteries. Its three largest competitors — Samsung (SDI), Panasonic and LG Chem — each command around 20 percent of the market. In an effort to change that, Sony is developing a new type of battery chemistry that can boost runtimes by 40 percent compared to lithium-ion batteries of the same volume. Sony's batteries use a sulfur compound instead of lithium compounds for the positive electrodes, reportedly allowing for much great energy density. Sulfur batteries can also supposedly be made 30 percent smaller than traditional lithium-ion cells while maintaining the same run times. The company is now working to ensure that the new battery chemistry is safe enough for commercial use.