How to change the battery in a Huawei Ascend P2?

Hello.

I am looking into buying an Huawei Ascend P2 as a value phone. However, I do not like the fact that the battery is supposedly not removable.

I'd like to know how hard it would be to change the battery. And I could not find any indication on how to open the Ascend P2.

Is it possible to remove the back cover, like on a nexus 4, or do I have to start with the screen like a HTC one ?