You can get 20+ minute runtimes from the stock cell. The 45 sec. barely fills the stock cell. I've had to charge 150mah cells for about 8 minutes to get a peak out of them, and they run for 45+ minutes. 3 45 sec charges are probably barely filling that 200mah cell, which has four times the capacity of the stick cell.
The MOSFET mod is kinda tricky because you're replacing the transistors on the PCB with FETs, but since the FETs are like 50 cent apiece when you order 10 or more. That definately makes it the best mod for the money. It gives your car insane power for instant acceleration, even with you fastest motor, and gearing.
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right before placing the car down on the counter, i pushed the forward control on the radio and the weheels spun again and i put it down on the ground to see how much more it would go... only a few feet, but it still impressed the hell out of me that it still had some juice.
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That's because rechargable batteries will stabilize their voltage after they are discharged. Any rechargeable will do that, put out a little more after you let it sit for a sec.