i used 3200mah with old tires. on points races i will run new ones and use 500mah more with new tires. so that would be 3700mah. i make the 5 min main no problem.
4000mah will fit but the 5000mah will not. my friend took the hard case off of the 5000mah so it would fit. it is not a good idea. you can fit a 6000mah soft pack in just fine. why can't you make the hard case go around the sides front and back but leave the top and bottom open. then they would fit in any car