Battery draining really fast (iOS and Android)

Hi! I'm testing my game on both iphone and android, and I can observ that the battery drains horribly fast!!

My game is a simple pixel game that uses Adobe Air 3.5, Axel Framework (for rendering with gpu) and one extension for ads.

Some data of my game consuming battery:

iPhone 4:   5 minutes = 2% less battery

iPhone 4s: 5 minutes = 5% less battery

Samsung Galaxy II: 5 minutes = 3% less battery

As I say the graphics are very simple and the game is only 4 mb.

Is it a general problem with adobe air apps?? somebody else has the same problem??