It was totally awesome. I finished it just in time for my new battery to come in. The computer says it took me about 47 hours to complete the game, though I did play the skirmish and challenge missions, and a couple of the campaign games I screwed up and died on a few times, so I don't know how much of that is the actual game, but anyhow.
Awesome game. If you're a fan of Turn Based Strategy games, I'd say pick this one up. It's not quiet Advance wars, but IMO, at the moment it's the best 3DS game available.
I'm just starting again and upping the difficulty, you get to select any level you want once you beat it, so that's cool. Only downside, you don't get anything new once you beat the game, which may be a turnoff to some people, but I'm Ok with it.
Now I just need to find someone to play the multiplayered missions with.
As for the battery, it's, well, a battery

It adds to the thickness of the system just shy of a quarter inch or so, and honestly, I like it as much for that as anything. It makes the system more comfortable to hold IMO. It runs about twice what the old battery did,s o with everything turned on it'll run 5-6 hours. Much better over the original. Oddly, it takes no longer to charge than the original battery does...but then, maybe it came charged

I'll see after I charge it again.
Love the dock that came with it, it has a "power" button to turn it on and off

I guess so all the lights on it don't cause a brown out if you happen to turn your Xbox on at the same time
Only thing I didn't like, maybe it was just mine,but it seemed the battery was a bit hard to fit into the hole in the 3DS. Anybody else got one that had issues getting the back seated into the back of the system? Once I got it in, it was fine, but good grief.