It can charge normal packs too, just need to have a traxxas plug on them. There's a balance port on the front of the charger.
When I started, I had the ez peak dual id charger and I used it with SMC 2S 9000mah lipo's. My issue with it was it would only put out 4A per port, which took forever to charge a 9000mah pack. Well... seemed like forever.