What to do if the USB charging in the car is too slow?
2 Answers
Not being able to quickly charge your phone is because the interface on the car CD player is for data transfer, not charging, and its output is only 500mA. Note that the current output of the car charger should not be less than the maximum rated input power of the phone; not only will it be slow, but it will also get severely hot, and prolonged use can damage the phone's battery.
I've also encountered slow charging issues in my car and later figured out a few solutions. First, check the data cable—original factory cables might have poor transmission efficiency. Switching to a short cable that supports fast charging can significantly speed things up. Second, look at the USB port's power output. Most built-in car ports only provide 5V/0.5A, which naturally results in slow charging for phones. You can buy a cigarette lighter adapter with QC3.0 or PD fast-charging protocols, which can output over 18W. This way, you won’t lose battery even while using navigation. Sometimes, the car’s infotainment system may limit output power, so it’s advisable to close background apps to reduce the load. Recently, new gallium nitride (GaN) car chargers have emerged—they’re compact, dissipate heat well, and are worth trying. If none of these work, it might be necessary to check if there’s a poor connection in the car’s circuit.
