As long as it matches, 3.7V is of course faster than 1.2V, but only if it's within the motor's allowable voltage range (it won't burn out). Additionally, lithium batteries can be used in model toys. The advantage is that they are lighter when they store the same amount of electrical energy. However, if the model has relatively large power (such as a four-wheel drive model). It is best to use an electric type lithium battery specially used for the model, otherwise the lithium battery will not be discharged and the actual effect will not be achieved. If the lithium battery overheats, it may explode and injure people.
Please also note: Lithium batteries without protective plates must not be short-circuited, otherwise the driver may burn people, or the battery may burn or even explode!