Using Chargers

Yanaiketsei wrote:

Is it safe to use it.

Can I use iPhone 6 chagee 5W to iphone13 phone.

Yes, it is safe, but it will be a slow charge and you may not be able to use the phone while it is charging. The iPhone 13 is happiest with a 12 watt or higher charger, or a Qi wireless charger.

Yeah although it might be a bit slow.

You can use a fast wall charger like a 20W. But you might find

this useful

About Apple USB power adapters – Apple Support (UK)