iPhone Accessories in Cellphone Accessories(1000+)

What is the difference between a 10w and 20w power supply for a smartphone charger?

The higher the wattage power supply, the faster your smart phone will charge. A 20w power supply will charge your phone faster than a 10w power supply. However, most smartphone's cannot accept more than 20w of power, so if you had a 30w charger the phone would max out at 20 watts.

Is fast charging or slow charging better for my smartphone battery

Slow charging is the recommended method of smartphone charging by manufacturers. Fast charging your smartphone generates more heat, more quickly, putting unnecessary strain on the phone's battery, while slow charging generates a similar amount of heat but in a longer period of time, so it is less strain on the battery. Whether you fast charge or slow charge, the battery will still degrade over time.

Is wireless charging bad for my smartphone?

Wireless charging does not degrade a battery anymore than wired charging. Whether you charge wired or wireless, it is all a matter of personal preference.