Mid-'15 MacBook Pro 15" battery life


hey, all. sorry if repeat thread--i searched thoroughly, hardly able find on forum.

purchased certified refurbished mid-'15 mbp apple 16 gb of ram, 500 gb of flash storage, , amd dedicated graphics card. according apple, advertised battery of said laptop should 9 hours of web surfing 75% screen brightness, , 9 hours of continual 1080p movie watching.

battery icon barely shows 6.5 hours 3 tabs open on safari, , when watching youtube videos, cuts down drastically 4 hours. late 2011 13 inch mbp gets better battery life this. normal real-time use?

it's little disheartening, considering how spent pretty penny laptop supposed have long battery life.
 

battery life varies based on usage, , fine print @ bottom says performed test using base model 15" rmbp. if usage causing computer switch on dedicated gpu, affect battery life.
 


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