Zelda's had a history of annoying ass sidekicks. Midna was easily the best of them. I WAS SAD TO SEE MIDNA GO. When Navi left I was like GOOD RIDDANCE BITCH.
So...yeah. I know I'm about 5 years late to the party, but I just finished Twilight Princess, and GODDAMN was it great. The 4 tiered fight with Ganondorf was in my opinion one of the best fights in the entire series. The music and environments were top notch, the dungeons were challenging yet...
It's called the Nyko Power Pak with Charge Base. It's only $30, adds very little bulk to the system, and nearly doubles the battery life. I'm pretty sure I'll be snagging this when I pick up a 3DS. You can learn more about it Here.