New mobile

I am quite happy with my new mobile phone. Especially the battery. My old one I had to charge every day. This one I charged Tuesday last week overnight for 10 hours. It's now down to a little bit less than half the battery left. This is great! It did say 400 hours in small print on the description, but no one ever believes that, do they? Perhaps I should... The model is Sony Ericsson Z610i blue in case you're interested.