Why is my IPhone4s battery dying so fast?

I've had my IPhone 4s for a little over a year, and I charge it every night and when I wake up it's at 100%. When I take it off the charger, it starts going down. I wake up at around 9 AM every day and by 1 PM it's already at like 40%. I still have the old software (haven't updated to I0s7 yet) and have like 2,500 pictures so is that maybe why it's dying so fast? Please let me know!

If I clear my old iPhone will the icloud back up stay on my new iPhone?

Someone I know has a new iPhone 5 and I'm having their iPhone 4. They saved everything on the iPhone 4 to icloud and then downloaded that data onto the new iPhone 5. I want to clear the iPhone 4 putting it back to original state, however, they are concerned that as this phone holds the original photos etc. That this might also delete them off the new iPhone 5. Does anyone know for certain if this will happen or what to do to avoid it? Preferably without needing to back up to a computer.

Best thing to do with iPhone in vietnam?

Going travelling for 6 months or so, don't know what to do with my iPhone 5. I'm terrible when it comes to technology. What's the best option for me to continue using it over there, to access internet etc without costing a fortune? I'm from the UK if that makes any difference.

What is the most realistic game you ever played?

What is the most realistic game you ever played?

Any console, any computer game, also one iphone game which is relistic and any type of game.

(For me it is Fifa 14 and COD Ghost on PS4 and real racing3 on iphone)

I want to know so i can play it my self.

Is the iPhone 6 going to have XLTE?

I have in iPhone 5s and I'm impressed with 4G LTE and now there (Verizon wireless)taking it to the next level which in many ways is fantastic.

My Iphone 4 shuts down randomly when not plugged in?

I've been listening to music today outside, sun was shining and suddenly it shut down, ever since it keeps shutting down if its not plugged in like in every 10 seconds, can anyone help, can sun be reason to damage battery or something? If so what can i do?