SolidEnergy's Solid Polymer Ionic Liquid (SPIL) lithium battery placed between Chinese smartphone maker Xiaomi and Apple's iPhone batteries. Photo: SolidEnergy

Out of juice? New battery technology could help smartphones last twice as long

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SolidEnergy's Solid Polymer Ionic Liquid (SPIL) lithium battery placed between Chinese smartphone maker Xiaomi and Apple's iPhone batteries. Photo: SolidEnergy
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