Which? tested a small number of laptops by seven different manufacturers.
A product review site named Which? found that most laptop brands overestimate the battery life of their products. The only laptop to live up to its claim of a 10-hour battery life was the Apple Macbook Pro.
The Acer E15, which is claimed to offer six hours, was good for just two hours and 56 minutes in Which?'s tests.
Among the worst performing models was the HP Pavilion 14-al115na, which put in four hours and 25 minutes against the claimed nine hours, and Lenovo's Yoga 510, which lasted two...
Dell's Inspiron 15 5,000 lasted three hours, 58 minutes. Each laptop is tested multiple times, giving the battery time to cover several discharge cycles. However, Which doesn't clarify considerations such as what the screen brightness is set at, or indeed in the movie test, whether that's a streamed film from YouTube, for example, or a USB drive (presumably it's not a movie played off a disc, as not every notebook has an optical drive). "As the figures we arrived at are often drastically different to the manufacturer claims, we have to wonder how their own estimates are arrived at".
Clearly, though, whatever the exact details of the above tests, it's still interesting to see the relative results, and it's quite an eye-opener as to how exaggerated some manufacturer claims appear to be. Laptop manufacturers generally test their devices with a standard selection of software that reflects the broadest demographic of users.
"It's similar to how different people driving the same auto will get different mileage depending on how they drive". Commonly used tests include performance in office applications, web browsing and video playback, all on a "clean" machine without the bloat that accumulates through months of PC usage.