It should be fine running those in series or parallel. It's only 200mah difference so you are not going to really do anything to hurt them IMO. If I needed to, I would hook them up together on my system. If you were hooking up parallel, you would just have to make sure the voltage is spot on (remember, the voltage is exactly the same on the two batteries. You can hook a 1000mah 2s to this if you wanted because the voltage is the same). so yea, I would do it.