[michail71]

I have to admit I was frightened by how hard it was to keep a charge on the phone the first few days.  I didn't believe everyone that said it got better.  But now I have no worries about getting through my day with heavy usage.

[cjlim]

Yes, I do remember being called a liar.  

[derSchlauste]

I bet you lie 

Do you have some advices how to charge the lumia?

I had 3 phone calls today over 2G network. Phone was around 90%. After 3 hours of calling the phone was at 21%. Display was on, phoned over speakers, connection was turned down to 2G only and WiFi was on but not transceiving anything.

I find this a bit weak, Nokias specs said calls can last up to 8 hours over 2G . I guess fully charged I can come up to 4-4.5 hours. I have my 920 10 day til today and charged it 7 times when it gets around 20-30% to train the battery. Don't know if this really works. Does it?

[cjlim]

4.5 hours of continuous talk time on speakerphone is not bad considering you have only had the phone just over a week. Bring the battery down to below 10% before charging once. Manufacture figures are based on theoretically ideal condition without being on speaker and nothing else on, including the display. The speaker and display in particular uses a lot of power. 

[derSchlauste]

To turn off the screen or to lock the device while calling will do the trick. I remember my Nokia C7 got locked automatically, but I think I have to get used to it to lock the Lumia while calling over speakerphone or Bluetooth.
Symbian was thoughtful. I hope WP will reach the same level.