Dell advertised 17 hrs of battery life per charge for the 9550 laptop, but I get 4 if I'm lucky, and that's only if I don't use UHD, which is one of the main reasons I bought the laptop. Furthermore, I was promised a 10% rewards card when I bought the laptop, which was not sent after 4 weeks of waiting, after which followed another 2 months of phone calls and getting the run-around from numerous customer service reps and supervisors. I finally received the reward by e-mail, after much heartburn. I will never buy a computer from Dell again.
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