You leave work and see that your phone is only 5%. So you plug it into one of the USB ports. After about 30 minutes you come home and your phone is only at 8%. Why in the name of Steve Jobs doesn’t it charge faster?
Here’s why: Most USB ports in cars aren’t phone chargers. They are inputs so you can connect your phone or flash drive to the car’s entertainment system to listen to music or use Apple Car Play or Android Auto. With few exceptions, these do not provide enough power to charge a phone. It can’t even prevent a phone from running out of battery when you’re streaming music.
Instead of using those USB ports, grab an adapter that plugs into the cigarette lighter. These have 4-5 amps and charge a phone 10-20 times faster than a USB port.
Here’s another thing: Stay away from those cheap car chargers you see at gas stations or drug stores. Those charging cables and plugs are not well made. Some have even caught fire when plugged into an electrical outlet. If you’re charging your phone in the car, it’s best to use a branded charging cable and car charger that fits into the cigarette lighter. The phone’s battery lasts longer in the long run.