It is possible to upgrade the internal battery...
iPhone 5S Will Have More Power
Can I replace my battery with the one from the 5s? - iPhone 5 - iFixit
How To Replace The iPhone 5's Battery
Replacement Battery for the Apple iPhone 5S 5C + Pentalobe & Pry Tool APN: 616-0728
iPhone 5 to 5c Screen and Battery Swap - YouTube
iPhone SE Full Tear Down Comparison with iPhone 5S
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Photo report disassembling iPhone 5s and iPhone 5c and comparing with iPhone 5 - GIGAZINE
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iPhone 6 Battery Size Leaks
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IPhone 5S & 5C Battery Replacement - How To : 9 Steps (with Pictures) - Instructables
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Original Apple iPhone 5, 5C, 5S, 6, 6s, 6s+ OEM Battery Replacement Good | eBay
Apple Increases iPhone 5C and 5S Battery Sizes relative to iPhone 5
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iPhone 5/S/C Battery Replacement Service - Original Apple batteries fitted - iPhonefixed.
Amazon.com: Winnerplusa Battery for iPhone 5 kit not Compatible with iPhone 5s : Cell Phones & Accessories
How To Replace Battery on iPhone 5, 5S, SE - YouTube
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Replacement Battery Compatible for Apple iPhone 5C | iPhone 5S - Batterie - GeaTech Store
