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!

The battery's performance won't be at its maximum forever. It will degenerate over time as you use it. If your remaining battery is going down that fast, it could be because you always charge it when it doesn't really need charging, as in when the % remaining > 5%. Or it could be because you use it for things that require a lot of energy, such as viewing videos with the volume on or having the brightness set to maximum.

Try turning off the Wi-Fi when you don't need it.

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