Any solution to dreadful iPhone 3GS battery life?

Prompter

New member
The phone was on my desk in standby mode for 6 hours, I disabled 3G, cellular data, WiFi and location services, closed all background apps and yet it still managed to drain 30% of the battery! GSM signal strength is always 5 bars where I am. Any idea what is causing this?
I expected it to last a couple of days in regular use, like surfing the web a bit, listening to music and making a couple calls.
 
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