My battery is draining fast (I can drain two fully charged batteries in a day) and when I look at battery usage it looks like its 70-75% display. I keep my display on "auto" and have the screen timeout to 15 seconds and "power saving mode" enabled. Is there anything else I can do? I really don't want to have to manually tweak my display (increase when outside and decrease when inside). Is "auto" really bad? Is there a way I can tweak the settings for "auto"