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Apple doesn't have to do anything. They have set the standard that everyone reaches for.

Do we have the same iPhone 4S? I mean the iPhone doesn't even have LTE yet and my battery is subpar at best compared to my iPhone 4. I can imagine how awful it would be with LTE!
 
Apple has not embraced LTE technology because it's too early. They will wait until the low power chipsets are available....
 
If the next iPhone is larger in size, which all rumors are pointing toward, then there will be room for a larger battery. If you have used an iPad, you understand how Apple can use extra room to make a better battery.

The rumors are wrong.

Apple believes that the iPhone size IS the sweet spot for a hand phone.

Will will not see a larger iPhone.
 
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