Running handbrake on my 15" tMBP (with the 2.9GHz processor) and noticed that the battery percentage has been slowly dropping (about 1% every couple of minutes). Using the official Apple 87W power brick. Believe the issue is probably that I am using an Aukey usb-c cable instead of Apple's, but not entirely sure. When I run handbrake with a different 87W brick and Apple's cable (in a different location), haven't noticed this. Could also be an issue with this particular power brick, of course. I'll try and remember to bring an Apple cable with me tomorrow to narrow the issue down.