Hi all, I bought a Sony Ericsson Arc.First time I charged it full till it showed 100% on the battery indicator.I put it on charge at midnight.In the morning when I got up at around 8 o'clock it said 79%.It was not in use the whole night.How come 21% has been drained during the night? Does it really have a very low standby time or talktime? Is it normal for it to drain that fast? Or can there any other opened applications working in the background? What is your advice to save energy?