I wouldn't worry about it honestly. I almost never ballence my lipos. Though I do check them from time to time and they are almost always withing a hundreth or two. I also run higher end lipos. I'd say if its free run it and have fun. When it puffs you know its out of ballance too far and done.

Opening it up you could cut into the pack and cause a fire so if you do it do it outside at least and be careful. Have a flower pot full of dirt ready and be prepared to burry the battery.. better yet dig a small hole and have some dirt handy to bury it with. fire extinguishers dont work well on lipo fires.