ASUS Battery Information Center. The battery pack's service life will depend on the environment temperature, humidity, and notebook PC usage. The battery capacity usage versus cycle performance attenuation follows a linear type curve. Lithium-ion (Li-ion) batteries typically have a lifespan of between 300 and 500 cycles.
1 Some state that the average human attention span is approximately 5 minutes; others state that most healthy teenagers and adults are unable to sustain attention on one thing for more than about 20 minutes at a time, although they can choose repeatedly to re-focus on the same thing.
Among the good news in the 54-page report is that our ability to multi-task has drastically improved in the information age, but unfortunately attention spans have fallen. In 2000 the average attention span was 12 seconds, but this has now fallen to just eight. The goldfish is believed to be able to maintain a solid nine.