Xperia Mini pro-How to increase the Battery life of the android phone?

Hello firends,
I had purchased an Xperia Mini pro last month. The main problem with my phone is drop in the battery power. How can I increase the battery power of my phone?
Is this the problem with all other android phones or is it only with Xperia Mini pro?

Hello friend,
Internet usage can impact your battery life considerably, even more so when you have fluctuating signal.
Do one thing, 30 second timeout and 10% brightness when not plugged in.
This will definitely improve the battery efficiency.