Looking at the specs, I'd think they just say 3000mAh because it can only charge up to 3.0A. You could charge a larger battery with it, just at less than 1C.

Have you taken a look at the Acucell-6 from Hobby City? It is very inexpensive and charges up to 5A. I have one and it is now my favorite lipo charger. http://www.hobbycity.com/hobbycity/s...lancer/Charger