New to electric. Went to local hobby shop to get a 2s 7.4v 300Mha. It only had two leads. I have read some articles about balancing cells, and asked the clerk about that. He said that you dont need to baleance a 2s pack. Yet I see on the Net a lot of 2s advertised with two leads and then an additional 3 or 4 leads, which I assume is for balancing. Hope some one can set me straight on this before I spend my money on something I don't need. slowgo