A:Answer Unfortunately, there is no standard method of measuring battery life, the way there is, for example, CPU performance. This means it is impossible to compare one company’s computer’s battery use vs. another. Some manufacturers do provide details on how they measured it, but this is a rarity. The best way to find this information is to search out reviews by trusted tech publications, where they give detailed explanations of their procedures, as well as comparisons to comparable models.
As a real-world example of the problem, I recently used Best Buy's Compare feature (always available at the bottom of any item they sell) to compare four different laptops. Two were MSI brand. One of the MSIs was rated at 40 hours, while the other one was 1 hour. I really doubt that there was such a great difference between two similar laptops from the same company; they were obviously measured under two radically different sets of conditions, and therefore essentially meaningless.
