As long as you put something on the batteries so that you don't over discharge them, you should be fine. The only reason I say to match the other numbers (which isn't actually needed) is to keep one battery from getting hot while you are running them. I now someone is going to come in here and complain that you don't need to match mah and c, but I feel better when the smaller battery has the same mah and a higher c lol. Call me crazy lmao.