Why are we telling you this? A similarly-sized display means that the device won't differ much from its previous generation and will be boasting mostly similar dimensions.
The thickness of the device, however, is rumored to be taking a hit. Samsung's next forerunner is expected to be as thin as an iPhone 6 (6.9mm). Naturally, such a diet normally paves the way for compromises in certain areas, and usually, that's battery capacity. See where we are going?
Recent rumors coming straight from South Korea claim that the Samsung Galaxy S6 will come with a 2,600mAh battery at the back. That's smaller than the Galaxy S5's one which measures 2,800mAh in capacity and kept the lights on for 7 hours and 38 minutes in our custom battery test. Interestingly enough, Samsung's 2013 flagship, the Galaxy S4, was its latest flagship to boast a battery with such a capacity.
It will be quite interesting to see how the rumored 2,600mAh battery will get along with the rest of the speculated specs (QHD display and either Snapdragon 810 or Exynos 7420 chipset) and how this combination of components will affect the battery life. Take these claims with a handful of salt, of course.