What do you mean stock batteries? The E-maxx does not come with batteries, you have to buy them seperately. Run time all depends on driving style and the quality of batteries. In my opinion, the E-maxx is overall a better offroader then the T-maxx due to it's massive amounts of torque from those titans. Sure, a stock t-maxx will beat a stock emaxx in a drag race (only on topend), but an emaxx will kill a t-maxx in a tug-of-war because of it's instant power. BTW, dont even try tugging an e-maxx around with any nitro truck, as it is horrible on your clutch! Plan on buying a new one if you try this.