Unannounced Asus Laptop featuring the U series Haswell, but Anand user review is saying 4.5-6 hours battery life
That's extremely good for a system with a 15.6" 1080p + touchscreen display, with a 4-cell battery. Ivy Bridge would likely have gotten less than that with a 6-cell.
If you want to see >10 hour battery life on a Haswell system, it's probably going to be on a 13" system with 50 Whr battery. More space constrained 11" systems with 40 Whr batteries will probably get to 9 hour. Obviously, battery life scales down with capacity, but 11" displays are also lower power, so it ends up balancing out.
With >15" displays, you'd expect OEMs to take advantage of the extra system space to put in 60-70 Whr batteries, which would help it to reach 10 hours. But 4-cells are 35-40 Whr, which is why you're at <6 hours with this machine.
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