All three notebooks achieve at least three and a half hours of battery life. However, the HP dm1z stands ahead of the other two Brazos-based systems. Despite using a more powerful APU, it also sports a denser battery pack that allows for a longer battery life.
Charging times are a double-edged sword. Ideally, you want a 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 cut down on the health of the battery. 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% region, which is why the charging time from 0% to 10% is faster than 90% to 100%.
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.
Interestingly, we see little difference between the 9 W dual-core C-50 and the 18 W single-core E-240. One might expect the NV51B08u and C655D to use more power than the dm1z. The larger 15.6" LCD panels usually correlate with higher power consumption, but it's important to remember that these are LED-based panels. LEDs consume little power, so the difference between 15.6" and 11.6" LCD panels is much less than the difference you would see with CCFL.