My iPhone 3GS battery is running down too quickly

In the last few days, my iPhone has started running down *very* quickly. I have been running iOS 6.1 for ages without any problems. Could this all of a sudden cause problems like this?
I have disabled mobile data and 3GS and just left the clock, calendar and reminders running, but this has not helped. It was 100% charged when I went to sleep last night, and when I woke up this morning it was down to 20%.
Can anyone advise me on a way to fix this please?

Really... took me all of a minute to find http://support.apple.com/kb/TS2802 which reveals:
Battery life seems short
Note: Charging with a FireWire-based power source is not supported, except on original iPhone.
Click ( www.apple.com/batteries/iphone.html) for tips on how to prolong iPhone's battery life.
Try turning  iPhone off and then on again.
Connect iPhone to iTunes and restore iPhone.
If the screen shows a low-battery image, the battery is low on power and needs to charge for up to ten minutes before you can use it.
When charging iPhone, make sure to leave it charging until it is fully charged. You'll know the battery is fully charged when the battery icon in the upper-right corner of the screen looks like this .
Note: When charging using a   computer, don't connect iPhone to   a keyboard. Also, the computer must be turned on and not in sleep or standby mode. If iPhone is connected to a computer that's not turned on or is in sleep or standby mode, the iPhone battery may drain.

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