Battier is expiring, so they won't be looking to dump him. If they trade him, it will be for talent to improve the team.
Erden might be palatable to them, since big men don't grow on trees. However, they'd have to take back more salary. And there's no way that they're taking on two years of Jermaine to give us Battier and only take back Erden.
It would likely take BBD, and I don't even think they really want him. They already have undersized big men in Scola and Hayes.