That article refers to the iPhone 6 which has only a marginal increase in battery size to offset the extra draw from the larger screen.

The iPhone 6 Plus (the one hellweaver666 is referring to) is the one with the much larger battery.

Nope. The article covered the Plus as well.

"critics said the iPhone 6 Plus offered slightly longer battery life"

"saying that the iPhone 6 Plus only lasted one full day of constant usage versus the iPhone 6's near two-day battery life"