Using a 5W charger for iPhone 13 Pro
I have come across loads of fake chargers. So I prefer to use my old 5W charger. Is this a concern?
no, I interchanged all chargers I had since the ipod touch back in 2007, only thing is ipads charge really really slow with 5watt ones it does not even show the lightning that it's charging but it is very slowly
have you read
About the battery and performance of iPhone 11 and later - Apple
and maybe iPhone Battery and Performance - Apple Support
and Batteries - Maximizing Performance - Apple