1. Choose a car charger with overload protection function. The reason why the on-board charger needs overload protection is because when the output current is too large and exceeds its normal output value, the life of the charger components will be shortened or damaged or even burned due to excessive temperature. Therefore, the on-board charger used in the car must have overload protection measures.

2. Select the car charger with an output current of more than 1A. The input voltage of the on-board charger on the market is basically 12V-24V, the output voltage is 5V, and the output current is about 1A-4A. If the phone is charging when the navigation function is provided, an inferior charger will not only not provide normal charging, but also continue to drop the battery.

3. Avoid buying compact car chargers. When choosing a car charger, avoid buying very small car charger products, because such products often do not have protection devices.

4. Do not blindly pursue car charging with high current and charging speed. Excessive currents tend to pose a greater danger when encountering line faults.

5. Purchase regular, quality-assured car chargers. To buy products certified by regular manufacturers, do not buy and use three-nil products, otherwise it is easy to have quality problems or cause potential safety hazards. After all, the issue of ease of use can only be talked about after security has been guaranteed.