I have been charging at roughly 2.5C non-balance mode on my G3 VX pack Redshift, I really don't see a problem with it, unless I somehow started charging the two packs in series when one was charged already... but that is dangerous no matter the charge rate. I just need to get a list of things to buy before I get some of those 3s-to-6s balance adapters that hobbyking has... sort of a waste to ship one little thing from china.