Does it matter? It's not as if I designed this laptop myself. I had 2 options. If you can only put a battery in your laptop that holds X W/hrs of power and you sell it with a CPU and other components that demand enough power to drain it in 3 hours, then that's a design flaw.

At least unless you put a big glaring "This laptop has 3 hours battery life" on the purchase page. Instead, they just repeatedly say how many Watts the battery holds and leaves you to assume that it's such a big number that it'll have great battery life.