Benchmark Results: Battery Life
It isn't surprising to see the Asus 1215N lead the pack. It has an extra-dense battery compared to the 1215T and benefits from Nvidia's Optimus technology. We should point out, though, that roughly one-third of our general use workload centers on multimedia playback. The other two-thirds includes office productivity (Web browsing, typing, and sending emails).
Our “Typical System Use Power” (TSUP) is similar to processor TDP, except that we are measuring power consumption of the entire system under our workload. Remember this is on the DC side, so it is unlike the power consumption numbers we use in other reviews. This factors out PSU inefficiency.
Charging times are a double-edged sword. Ideally, you want a nice slow charge so that your battery lasts more than a few hundred charges. Fast charge times keep you away from the wall socket longer, but in the long run they cut down on the battery's useful life. Manufacturers utilize a variety of charging schemes to strike a balance, which is why we are showing two benchmarks. Usually, the rate of charge starts to slow down somewhere in the 80% to 95% capacity range. That's why the charging time from 0% to 10% is faster than 90% to 100%.