I have brightness at 25%, no GPS settings on, and with mainly wifi usage. But my battery drains like crazy. I mainly just browse with no videos watching.
I have been experiencing sort of the same thing. I deleted some applications that kept running for no good reason and that seemed to help. Good luck with your situation.
Sent from my Galaxy Nexus using Android Central Forums
Your mobile network signal looks pretty iffy. Are you in an area with poor signal? Your phone could be negotiating for more power to keep a reliable signal. As previously mentioned... 14-16 hours before the first charge isn't horrible for a stock battery, but since you mentioned using an extended battery, it makes it a bit more significant.