Due to the Envy 4's discrete GPU, it doesn't have as much space within its chassis for a larger 6-cell battery, although this is partially compensated by its higher capacity battery. Comparatively, the 15.6-inch Acer M3 is even bigger, and as such, it does have the available internal space for a large battery. We tested all devices with Powermark V1.1.1's Balanced profile benchmark, which simulates everyday usage through web browsing, word processing, video viewing and light gaming workloads.
Both the HP Envy 4 and Acer Aspire Timeline Ultra M3 were tested using their integrated graphics option selected since these everyday workloads don't benefit much from discrete graphics and the fact that we need to compare against the Sony Vaio T and the reference notebooks that are only equipped with integrated graphics.
|Specifications/Notebook||HP Envy 4||Acer Aspire Timeline Ultra M3||Sony VAIO T||Intel Ultrabook (Ivy Bridge)|
|Battery||4 Cell Li-ion / 62 WHr||6 Cell Li-ion / 58 WHr||6 Cell Li-ion / 45 WHr||6 Cell Li-ion / 47WHr|
|Dimensions||340 x 235.8 x 19.8mm||375 x 250 x 20mm||323 x 226 x 17.8mm||329 x 223 x 16mm|
Despite the HP Envy's 4-cell battery, its battery life was quite respectable, reaching 3 hours and 39 minutes, more than enough for watching a movie.
Power consumption on the Envy 4 was the worst of the four, but still decent only because of its larger 14-inch screen as opposed to the comparison notebooks using a 13.3-inch screen. Furthermore, there wasn't much difference between the tested notebooks.
Our portability index takes specs like weight, volume and battery life into consideration and tells you just how portable a machine is. The Envy 14's slightly larger size and weight brought down its overall score compared to the other Ultrabooks on our list (except for the larger and heavier Acer M3) but it was much better than the multimedia notebooks on our chart such as HP's Pavilion DV6. Overall, it seemed to be in a decent spot considering the Sony VAIO T's position which was somewhat underwhelming for a 13.3-inch Ultrabook.