This tester is everything you need to test USB-C ports, chargers, and power banks, and at a price that's not going to break the bank.

Test resistance To gauge the quality of the cable, I use a four-wire, milliohm meter attached to the cable using USB breakout boards on the VBUS and ground wires.

Many smartphones have fast wired and Qi charging, but both are reduced by various optimizations to maintain your battery.