IPhone 5S & 5C Battery Replacement - How To : 9 Steps (with Pictures) - Instructables
Why does my iPhone 5s battery suddenly drop from 43% to 20% and then 10% suddenly? Is this battery to be replaced or is there something other malfunctioning? - Quora
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New iPhone 5S 5C Battery Life
Apple Increases iPhone 5C and 5S Battery Sizes relative to iPhone 5
Amazon.com: (Upgraded Version) Battery for iPhone 5S/5C, BOANV Ultra High Capacity New 0 Cycle iPhone 5S/5C Battery Replacement with Professional Replacement Tool Kits : Cell Phones & Accessories