I just ran Battery Eater on the N510. Wlan was on, Display on 50%. Battery Eater simulats 100% CPU usage over the hole time. It lasted 4 hours 1minutes bevor shutting down. This confirms my experience. Using the N510 normal (Surfing,Reading,Writing,Youtubing, but not Gaming) you easily reach 5 hours. Shutting wlan off and turning the display down, 6h hours are reachable.