Don't! Every part of the electric car is produced by different manufacturers and finally assembled! Generally, electric vehicle manufacturers only make the main part of electric vehicles, generally speaking, it is the big frame of the car, and other parts, such as controllers, motors, batteries, meters and so on. , are produced by other manufacturers! As for the brand of electric vehicles, batteries are only required by electric vehicle manufacturers! I suggest you still use a small battery, which is what you said, 14AH, because there is no famous brand of 20Ah battery, and its service life is generally less than one year! 14ah battery should not use the so-called Emma battery. As mentioned earlier, it is actually a battery manufacturer designated by the electric vehicle manufacturer. Although the battery is not a fake, it is not very good! It is recommended to use Wei Chao, Tianneng and other professional battery manufacturers! If you insist on changing it to 20Ah, the price that the man said is acceptable! And the quality of the replacement 14Ah is also guaranteed. Generally, you can change more than 300 yuan without exceeding 400 yuan!