The battery issue is here. You can either get an extended, or a super extended battery. Each comes with a suitable back cover. Or, you can get an extra battery and it's charger. Or just keep it on the charger when ever possible.
This battery issue is one of the biggest issues. It was anticipated, that is the reason for the lip at the bottom back. We accept these imperfections because this phone is still awesome. The first phone designed for ICS. There is NO better option... Yet