I bought a new 2018 15'' MacBook Pro with Touch Bar a couple weeks ago. So far its battery life has been abysmal, reaching 0% after less than 4 hours of very light usage (only web browsing).
I decided to test the battery life today by having my regular applications (Safari, Firefox, and a few others) open and just letting the MBP sit on my desk. I should emphasize that there are absolutely no intensive programs running whatsoever; just a couple of web browsers and things like iMessage.
Right off the bat, it tells me at 100% charge that I have 2:07 remaining.
Around 20 minutes later, I checked again it is already down to 90% charge with 3:36 remaining.
Another 10 minutes later, it is down to 85% with 3:04 remaining.
After 3 hours and 46 minutes, the battery level reached 0% and the machine went to forced sleep.
Considering that Apple's advertised battery life is 10 hours, I find it extremely perplexing that my MBP is getting less than 4 hours of battery life doing nothing except sit on my desk with a couple web browsers open in the background. During this test, there were just nine tabs open between the two browsers, and they contained only mundane sites like Wikipedia and Gmail.
Has anyone else experienced issues with battery life on the 2018 MBPs? If you are getting close to the advertised 10 hours, what kind of activities are you doing?
After further testing using gfxCardStatus, it appears that having a program using Java open in the background forces the graphics card to stay at the high performance discrete option. Is there any workaround for this? It is frustrating to have to close a bunch of applications every time I go out so that my battery lasts throughout the day.