i have a dynamite mega1 quick charger. it charges nicd and nimh can i charge 3000 or 4200 packs on it?
yes, you should, idk anything about the charger, what amp does it charge at? it should anyways.

another question. i use 1500 nicd in my emaxx. if i get 3000 nimh batts i should get a few more minutes of full batt power before they start wearing down right?
yes a lot longer in your case