My son’s iPhone 11 charges really slowly. Anything I should do to fix it or just take it to Apple? He had complained it is way slower than his XR was. I dismissed his concerns thinking he just doesn’t charge it enough bc he’s 13 and doesn’t always think to charge it but last night I had it on the charger for my 11pro max for two hours and it is only charged to 55 percent. Does the 11 have the fast charging?