If you need a car charger now, you can buy one for a dozen bucks and throw it away in a few days. That's no big deal. But if you want to buy a long-term, high-bandwidth use, it's not that easy. How to choose a long-term USB car charger?
Appearance of car charger:
1. The appearance must be good, without burr, the insertion must be convenient and smooth. The metal contact should be thick, uniform and elastic. Plugging in a difficult charger can be very easy to damage.
2. The shell conforms to the Rohs environmental protection standard, hard and flame retardant. The charger will heat up, and if the plastic case does not meet the Rohs standard, the gas will come out. The gas in plastic is very powerful. It is not rigid, flame retardant plastic, will be heated by the chargers or even fire.

In the circuit part, the circuit of the charger is roughly the following:
1. Resistance partial pressure type. There is a robust resistance inside the car charger. The output voltage is unstable, and the resistance itself is very calorific. In addition to being cheap, there are no other good points. The output current can be large. Without short circuit protection, the consequence of short circuit is to fire or burn the internal circuit of the car.
2. Voltage stabilizer is a relatively large voltage stabilizer. Can output the current of 1A. Short circuit is dangerous, the current of 1A is not for fun. Because of its ability to load, this voltage slightly above 5V can charge faster.