Hello.

I just bought Dell insporion 3583 and, judging by reviews, it doesn't measure up. 

Idle with full battery saver and lowest brigtness and only WiFi on, battery lasts 4 hours. Web browsing under the same conditions, it lasts less than 3 hours. It's 42Wp 3-cell battery.

I need a solid laptop with lasting battery life, so please tell me if I'm an idiot and this is how things really are or is my battery defective?

Thank you!