Well, Patrick -- here's hoping the collective readership in comments can "provide" you with "some advice" for "your brother." We're guessing they will.
"My brother is shopping for a laptop and wants long battery life, but also the ability to play games such as Minecraft on a reasonable graphics setting. His current laptop gets about two hours of battery life and he plays Minecraft at about 15 frames-per-second. The definition of 'long battery life' is vague, but obviously the longer, the better."