It is possible to upgrade the internal battery...
Taking a Closer Look at the iPhone 5, 5s and 5c
Teardown Finds iPhone SE and iPhone 5s Displays Interchangeable - MacRumors
Stronger battery inside iPhone 5s/5c detailed
Iphone 5s Battery Replacement and Repair in Kenya
How To Replace The iPhone 5's Battery
iPhone SE Full Tear Down Comparison with iPhone 5S
Looking inside a (fake) iPhone 5S battery | Rip It Apart - Jason's electronics blog-thingy
Differences Between iPhone 5, iPhone 5s, iPhone SE: EveryiPhone.com
Buy iPhone 5 battery? Full repair kit available from us! | Stuff Enough
Internal Battery For iPhone 6 6S 7 8 Plus X XR XS Max 11 12 13 Pro Max Mini Lot | eBay
iPhone 5/S/C Battery Replacement Service - Original Apple batteries fitted - iPhonefixed.
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Key Differences Between the iPhone 4S and 'iPhone 5' Battery? [Photos] - iClarified
Exchangeable Battery for iPhone 6S+/6+, iPhone 6S/6?
Will the iPhone 5c battery fit in iPhone 5s? - YouTube
Would an iPhone 5 run normally if the original battery was replaced by a 1624mAh Li-Ion Polymer battery for an iPhone 5SE? - Quora
iPhone 5 vs iPhone 5c: All The Differences You Should Know About
Apple Increases iPhone 5C and 5S Battery Sizes relative to iPhone 5
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iPhone 5S vs iPhone 5C: What's the Difference? [VIDEO]
Can I replace my battery with the one from the 5s? - iPhone 5 - iFixit
iPhone 5, 5s Battery Replacement New Zealand | iGadget
New teardown reveals iPhone SE contains display identical to iPhone 5s, larger battery | AppleInsider
iPhone 5 to 5c Screen and Battery Swap - YouTube
