July 17th, 2011, 07:47 AM
Moderati ergo sum
Join Date: Jun 2010
Device(s): Nexus 4, Galaxy S II,
Nexus 1 (retired),
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Welcome to Android Forums, Didier.
Battery life is always a concern at first. There are a couple of things at work here. First, you are more likely to use a new phone a lot more, getting to know its features and setting it up. Second, smartphones in general do a lot more than feature phones so their power requirements are higher. Finally, modern batteries don't need to be conditioned, but Android does need to be taught was the capacity of the battery is. You should see improvement over the next few weeks of use.
However, battery life will never be great, by virtue of point number 2. Check the forum Bobcat so graciously linked for tips on battery optimization.