Apple's iPhone 6, rumoured to come in a larger 5.5-inch size with iPhone Air name, could be delayed until as late as 2015.

Since the 5.5-inch iPhone 6 was never confirmed this isn't a huge disappointment, but it certainly keeps Apple trailing behind the competition's phablet offerings. Presumably Apple will still reveal an iPhone 6 around September, as it does every year, only this might not be accompanied by a larger sibling as rumoured.

READ: Apple's iPhone 6 could arrive with a 5.5-inch display and iWatch may have 1.3-inch AMOLED screen

The issue, according to Taiwan's Commercial Times is battery related. Apple wants a battery no thicker than 2mm, but manufacturers can't get it smaller than 2.8mm. The larger 5.5-inch display will require more juice to run than the iPhone 5S's 4-inch display.

The iPhone Air, as the rumour mill's manufacturers are referring to it, will have to remain slim for Apple to be happy with it, in spite of the jump in screen size. This suggests that the smaller iPhone 6 could come with the Air name and be slimmer than the current model.

Competition from Samsung, HTC and LG, who all offer larger screen options may still be ignored by Apple for the iPhone 6 release. Here's hoping the fruit giant reveals the larger iPhone soon, perhaps in time to release it with the iWatch?

READ: Apple iPhone 6 release date, rumours and everything you need to know - PAY MONTHLY PHONES Get the brand new Samsung Galaxy S9 and S9+ on the network that gives you 4G in more places than any other. EE runs the UK’s biggest and fastest mobile network, offering superfast 4G in more places than any other operator after pioneering the UK’s first superfast 4G mobile service in October 2012. The networks coverage extends to 90% of the UK’s landmass and EE has received extensive independent recognition, including being ranked the UK’s best overall network by RootMetrics.