The Alienware M15 R7 is definitely on the ... which was the entry-level version of the laptop. An 86Whr battery powers the M15 R7, but the battery life here isn’t great. I found that it lasted ...

A versatile gaming machine, the M15 R7 balances power and portability ... Given their high-performance specs, Alienware laptops often have shorter battery life compared to non-gaming laptops.