I was wondering If it is possible to make it so I can trade in my not used tank hules and weapons, power ups, ext, ext, ext. And trade them in for crystials, that way, if I have a unused turret hule, I can trade it in for the crystials I spent on it, because Im shure there are lots of players (Me inculeded) that started the game and bought every thing they could, and then we\me find out that they are not what I wanted, It just would be a very nice extra thing to add in, thanks!

What are battle funds? I see them in the corner, And I dont know how to get\use them? please help, thanks!