No.
1. Car batteries are usually around 12V (some are 24V) and the starting current is tens or even hundreds of amps.
2. only 7.2 V and lithium. The battery discharge current is very small, only a few amps at most, and the working environment temperature required by lithium batteries is relatively harsh from 0 to 50 ℃. In order to prevent excessive overcharge and discharge from endangering the life of lithium batteries or even explosion, ordinary lithium batteries have internal charge and discharge protection circuits. When the output current exceeds the maximum value, they automatically protect and cut off the output.
Why can't I buy it? Taobao is in Shanghai. What type of airplane model are you? As long as it is a model airplane and not a toy, using a battery9V is no problem and there is no need to lower the voltage. ESC motors of general aircraft models can use 22V batteries. The higher the voltage, the greater the power. The main thing to note is that the current cannot exceed the maximum design of the ESC. The size of the current is determined by the design of the motor. The model's 7.2V battery itself uses two 3.7V lithium batteries connected in series.