Xperia V vs Xperia J

Question

Android

Hello.
Please explain this to me. Which device is the most energy efficient.
There are two still unsold phones from Sony's new line.

They have a completely identical 1750 mAh battery.

Differences:
Xperia V - dual-core MSM8960 and 4.3-inch screen
Xperia J - single-core MSM7227A (old man) and 4-inch screen

Question: which will last longer?

My assumption: in theory, I was hit on the ears, supposedly dual-core processors will be more economical (plus for V), but the screen is larger (minus for V).

Answer 1

so it is written in the characteristics that the Xperia J works longer ... it will work longer)
another question is “what does it mean to work?” V has a newer processor in a more modern process (28nm) and has a better performance / watt ratio than the old processor, which is in J (45nm). But the processor is not the biggest consumer in the phone, my leader in consumption is the screen)

Answer 2

I myself sit on the Xpreia Arc S, the battery is weaker, the screen is 4.2, it lasts for 2 days (if you don’t use the waffle, with a waffle for a day almost to zero). At the father of those. the process is the same as 7227, the frequency is higher.