I am using the Nokia Lumia 620 for about 1 month. Although in general I like the phone, there are some things about it that are rather curious. One is that the usage of the battery follows a strange path. First it will continue 100% for a long time (dependent of the usage sometimes over half a day) and when it has reached the 40% then, even if you don't use the phone, it goes quickly to zero.
On my former phone, a Nokia 701, the path of the usage was quite normal.
Does anybody how to resolve the problem? It happens with all of the apps concerning battery usage, I suppose they all get the data from the OS.