I hope this video explains some questions about Apple's battery designs and technology.
http://youtu.be/w6lLdFxiZPc
Just like everyone else, when I first read the specs about the IP5's hardware along with the 1440mAh battery, nothing makes sense at all until some 3rd party iPhone parts dealer puts the IP5's logic board under a microscope and confirms all the chipsets nm specs.
If you compare the CPUs, GPUs, the size of the phone, size of the screen, the multi region LTE bands, the battery life and look at the benchmark results, no other manufacture comes close. After all that, look at how smooth iOS runs and how efficient battery life can be with heavy usage in a "strong signal area"
Imagine if Apple made a massive 5.5" phone, Quad Core CPU & GPU, 2GB RAM and accompanied with a 3000mAh battery? It would be 2-3x faster then the Note 2, last 2-3x longer and perform 2-3x faster. Android needs all that horse power just to stay a live with all their manufacture skins, blotware and sketchy OS builds.
My iPhone 3G still runs very strong on the original battery, it's all about how condition the battery and your signal strengths plays a major role on battery life. Apple should stay away from dev a new form of battery material, if they did that they would blow all their money in R&D like Nokia and end up like Nokia, making prototype phones that will never see the light of day.