hey guys I did the duel cell mod for my zz. I got the both batteries under the pcb. I tested out my car and it screamed. A few hours later I tried it again but it was slow as mollases. I played around with the car to see if it would go faster but it didn't. I charge my cars with my modded charger. the car should get enough juice. The next day I took off the second battery and I drove just like it was brand new. well if you got any ideas that tell me