10% in 2 hours means 100% to 9% in 20 hours, which isn't great, but it's good. Check your mobile signal (Settings/General/Battery. Tap the graph and look at the bottom of the next page. If Mobile network signal is anything but green or white (IOW, yellow or red portions), you have a weak signal where you are (meaning you're using the wrong carrier) and it's costing you battery.