Bests & Worsts Reviews from Amazon

Battery life is supposed to run up to 11 hours yet mine dies at around 1-2. I've been on it right now for about 20 minutes and the battery has dropped about 15%. My laptop also begins to get really hot after using it for a while and I can hear the fans running at their maximum. I'm not sure what the issue is since the sellers are selling authentic apple products. I will be returning and just purchasing from apple.