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The leaf on the Apple symbol is tinted green at the Apple flagship store on 5th Ave in New YorkREUTERS

It is obvious that Apple fans will be left disappointed if the latest report on the battery of its upcoming flagship smartphone dubbed as iPhone 6 turns out to be true. Gadget lovers are expecting a powerful battery from the new device, but the latest reports suggest that it will be ultra thin yet similar to the one seen in iPhone 5S in capacity.

The release date of iPhone 6 may fall in the month of September though Apple Inc. is tight-lipped. Reports have suggested that the new device could be a game changer for the Cupertino giant.

However, one aspect that has disappointed iPhone users and might do again when the new flagship smartphone arrives is its poor battery life. DigiTimes has reported that iPhone 6 may have a 2mm thin battery, but similar in capacity to the one that powered the iPhone 5 series. It added that 60-70 million units of the device are expected to be sold by the end of this year. 

Apple iPhone 5S has 1,560 mAh battery, while 5C has 1,510 mAh.

The 4.7-inch model of iPhone 6 may come with a 1,800 mAh battery, an upgrade from 1,560 mAh found in the iPhone 5S, and the 5.5-inch model may have a 2,500 mAh battery, according to a report by Forbes (via Mobile.it168). 

The fact is, iPhone 6 battery will be way behind its rivals, even if it upgrades from 1,560 mAh seen in iPhone 5S to 1,800 mAh. It may be mentioned that Samsung Galaxy S5 has a Li-Ion 2,800 mAh, Nexus 5 – 2,300 mAh, LG G3 – 3,000 mAh, Sony Xperia Z2 – 3,200 mAh, HTC One M8 – 2,600 mAh and Motorola Moto X – 2,200 mAh.

iPhone users have long been complaining about the short battery life of their devices, with many claiming that it barely lasts a day. A survey by mobile discount aggregator WalletHero also revealed that 97 percent of respondents want iPhone 6 to have a longer battery life.

The Cupertino giant is expected to launch two models of iPhone 6 – a 4.7-inch and a 5.5-inch. The smaller variant may come with a 1920x1080p (440ppi) resolution, while the larger model may feature a 2272×1280 (510ppi) resolution, according to KDB Daewoo Securities. It is expected to be powered by a 20-nanometer A8 chip (64-bit) processor and run on iOS 8.

Chinese analyst Sun Chang Xu revealed that the device might feature sensors that can detect pressure, temperature and humidity, while Apple Insider reported citing analyst Ming-Chi Kuo that the smartphones may feature low temperature polysilicon in-cell touch panels, Touch ID fingerprint security, NFC and metal casing.

The company is tight-lipped on the release date of the device, but most probably it will see the light of the day in the third quarter. German website, ApfelPage claimed citing leaked internal documents of German wireless carrier Deutsche Telekom that it will be unveiled on 19 September, contradicting reports that it might happen in the first or second week of the month.