You will be amazed to hear that you can not replace the battery of newly announced Nokia N8 easily. If you want to replace the battery, you will lose the warranty of the device.
The whole device is tightly closed. Even the user manual of Nokia N8 doesn’t say anything about removing the battery, but ArabNokia.net has published some pictures to show how to swap the batteries by removing two screws.
Tip: You can read the complete specifications of Nokia N8 here.