iPhone 4 battery tests - reviews - articles -etc

[ElCidRo]

I was arguing with a friend that iPhone 4 is better than most smartphones when it comes to battery life.
For the life of me I can't find any charts or articles to prove this to him.
I remebered a chart I saw showing the iPhone 4, 3GS and some Android phones, and I remember the iPhone 4 having almost double the battery life.

Could you guys help me with some reviews, tests links etc pretty please?

 

[testcard]

Googling "cell phone battery life" brought up this:

http://reviews.cnet.com/cell-phone-battery-life-charts/