I am having a similar problem and would like to know if anyone found a solution to this problem. I am using a similar batching concept with a kdtree. Each node has a batch associated with it. Only the batches inside the frustum are drawn. Migrating a vertexlist from a batch to another leaks a chunk of memory proportional to the size of the list. This should be a problem for the sprite.Sprite class buts it's probably unnoticeable because only 4 vertices are migrated. I would be curious to know if anyone tried migrating a vertexlist to another batch or changing groups repeatedly and has had memory issues.
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