MBoards batteries have been of questionable build quality and overpriced (based on the quality you get), there are a lot of better alternatives.
I would get a meepo battery before a MBoards battery, but better yet get a custom battery from someone on the forum. Also, ask @kook about MBoards, he has some strong opinions about them.
Get the best battery you can afford, there is a lot of energy stored in our packs, and the potential for fire or injury is very real if the battery is not built properly.
Check out these threads, there are a few people missing from the wiki that make very nice batteries, you can check what people have made in the other thread: