Any ideas why this is happening: my screen is at the lowest brightness setting, yet it's using up 86% of the battery. I'd post a link to the screen shot but apparently I need ten posts.
It doesn't mean that it has used 86% of your total battery, it just means out of what it has used, 86% went to the screen. The screen is the biggest drain on the battery, so if you are using that a lot more than anything else, it will be higher up. I wouldn't be worried about it though