The best wall chargers deliver fast charging speeds for your iPhone, Samsung phone, iPad or Android tablet. 20-30 watts is ideal for smartphones and tablets while 60 watts or more is for laptop chargers and chargers for larger devices. If you want fast-charging capability, you should consider a USB-C charger. If you have multiple devices that you want to charge at the same time, look for a wall charger with multiple charge ports.

If you use a car charger for your phone, you can leave it plugged in, even when you’re not using it or if the car is turned off. The same applies if your car has a USB-A or USB-C charge port for a charging cable. The charger won’t draw power from the car unless a device is plugged in that draws power. To check if your car’s charge port draws power constantly, plug a device and turn your car. If the device stops charging you can leave your charger plugged in. If it keeps charging you should unplug your charger.

USB-A and USB-C cables refer to two different connectors that are standard for a wide range of devices. USB-A is the traditional, rectangular connector that’s found on older laptops and chargers. They typically support slower charging and data speeds. USB-C is the modern and faster connector that delivers faster charging speeds and data speeds. The USB-C port is smaller and oval-shaped compared to the USB-A’s rectangular design.

The main difference between a car charger and a wall charger is their power sources and their charging speeds. Car chargers use a 12-volt outlet to deliver convenient on-the-go power. They do have slower charging speeds compared to wall chargers. Wall chargers plug into 120-volt/240-volt outlets that deliver more power and faster charging speeds.