So, i attached a 12v battery to a remote control car to make a model. The model has a switch that turns the car on, however, the 12v makes the car spin insanely fast, so i am now trying to slow it down. I tried reducing the battery voltage to 9v using a few resistors, but for some reason the car did not even start up. Then, i tried reducing the battery voltage to 6v, and still nothing. A while later, i made an improvised 7v battery using two 3.7v LIPO batteries. I connected both in series and once again, the car didn't start up. After that i made another 7v battery, and connected it to the other 7v battery to double its amperage. After doing that, the car started up. I then tried to do the same thing to the 12v battery (connect both in parallel to double their amperage) and then reduce their voltage, and it didn't work. Can anyone help me? (by the way, im an absolute newbie with electronics).