The battery usage looks about normal for a new device. As wrecklass said, give it a few days. And charge it when it gets down to about 40% if you don't want to make the battery manufacturers rich.
If you update, you can't update for another 24 hours, even if an update is available. It's to keep the internet and wireless data usage down to a reasonable level. (Imagine if every new phone started updating on Christmas day, and had to do a few updates to get to the current version.)