When i first got iPad when using I'd be on pace for 11-12 hours of total battery life. That was browsing the web, using apps, etc. Charged it last night and even just browsing I'm on pace for under 10. Watched a 25 minute video on abc app that drained 12% battery in fairy low ambient light. Ive turned off push notifications and the brightness is around 50%. I didn't thinknthis was defective based on my charge out of the box but now im getting worried. Thoughts?