Battery widget reborn is pretty neat, you can set it as your screensaver, always displaying the % of charge, time remaining until full...
Here's a good technique on beating the game:
[video=youtube;gD-nzHy2DdU]https://www.youtube.com/watch?v=gD-nzHy2DdU&feature=player_embedded[/video]
Poor Nexus
Actually a Spring branded Galaxy S2.