Solution to 4S battery draining AND yellow screen.
The solution to the battery:
The iPhone 4S has tremendous of power in comparison to other hi-end phones and other iPhone models. The power comes from our beloved A5-SoC processor.
The A5 has to offer lots more of power in exchange to more power. More power means more heat and faster draining. The processor is mainly used to process Siri and other demanding applications. We decided to incrase the battery wattage by about 0.1-0.2(I think) watts. These extra watts helps a little to "keep it up" but it still uses a tremendous amount of power. Simple logic; an old 8-bit game uses a LOT less power than a big server room/datacenter. You users out there(includes me, I'm a 4S user too) will just "have to live with it". We can shut down running applications and undergo a charging cyclus* a month. Shut down running background applications by: pressing home twice, thus opening the bottom line of applications and hold an app in for as long that a red mark will appear. Press the red marks by the icons to close background running apps.
Solution to yellow screen:
The yellow screen problem is just literally glue from the factory, to hold the screen panel in place. That is why you can open a touch iDevice with a heat gun (DO NOT ATTEMPT, I WON'T GIVE YOU A NEW ONE!!!). The glue melts. The yellow screen is simply glue that hadnt dried. I was like that with all previous touchproducts. It is said that time is a good healer(except for age).
Let's hope this post clears it up a little.
--Daniel Isaksen
iPhone 4S, iOS 5, Solution to battery draining