Nowadays, mobile phones have more and more functions, and the screens are getting bigger and bigger. They can also be used as audio, navigation, etc. while driving, but the battery is consumed faster. When you are out and about, it is a rhythm that drives people crazy when your mobile phone runs out of power. Therefore, car chargers came into being. Although the things are small, you can't be careless in choosing them. Pay attention to these 5 points when buying car chargers.
Output current
The input voltage of car chargers on the market is basically 12V-24V, the output voltage is 5V, and the output current is about 1A~4A. Although most cars also have USB ports, the current is only about 500mA. When using mobile phone navigation, the power charged is not enough to cover the power consumption. Taking the iPhone4S with a battery capacity of 1470mAh as an example, it only takes about 2 hours to charge with a 1A current, and the time is basically doubled when using the USB port in the car.
Overload protection
The USB specification requires that the current overload protection must not exceed 5A. The reason why the car charger needs overload protection is that when the output current is too large and exceeds the normal output value, the life of the charger components will be shortened or the temperature will be too high to cause damage or even burn. Therefore, the car charger used in the car must have overload protection measures.
Short circuit protection
Short circuit protection is also necessary, because once a short circuit occurs, the cigarette lighter fuse will be blown at the least, and a fire will be caught at the worst. Basically, all car chargers on the market have short circuit protection devices, but when the short circuit device is unplugged, some products need to unplug the device to automatically start and continue to supply power, and some products still do not supply power after unplugging the short circuit device, and need to be unplugged from the cigarette lighter and reinserted to continue to supply power. Of course, it is more convenient for car owners to have a charger that can automatically restore power.
LED light
Car chargers on the market are equipped with LED night lights to facilitate the confirmation of the position when driving at night. However, the brightness of the LED light should be paid attention to, because it will not have any impact on driving during the day, but if it is too bright at night, it may distract the driver's attention and affect driving safety. Generally speaking, the LED brightness can be seen without being dazzling.
Does it consume electricity after the engine is turned off?
Although 80% of vehicles stop supplying power to the cigarette lighter after the key is removed, some cars still supply power to the cigarette lighter. If the owner forgets to unplug the car charger, will it damage the vehicle battery? Generally speaking, the car charger has no current output when it is not connected to a load. Even if you forget to unplug it, only the small LED light is working, and the battery power loss can be ignored.
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