Hi there , I’ve just got back into the hobby after 30 years . I’ve still got an old grasshopper and I want to buy a new nimh battery , I would like to know what is the largest capacity 7.2v pack I can buy that will fit in the battery compartment of my grasshopper. I like the thought of a 5000mah I imagine I could get close to an hours running time using the standard 380 motor ?