I just upgraded to a 12 MINI, sales person told me to only charge the phone with a USB-C adapter (had to purchase separately) or a wireless charger. Chargers from older model iPhones will damage the battery. This doesn't sound reasonable
iPhone 12 mini
In addition to some of the comments made earlier, I think if it would damage your battery then Apple wouldn't say this in their documentation:
About Apple USB power adapters
https://support.apple.com/HT210133
"You can use any of the adapters listed below to charge your iPhone, iPad, Apple Watch, or iPod. You can also use third-party adapters that comply with applicable safety standards."
That list includes even a quite old model 5W charger. The main difference is a 5W charger will take longer to charge an iPad for which a 20W charger was supplied.
In addition to some of the comments made earlier, I think if it would damage your battery then Apple wouldn't say this in their documentation:
About Apple USB power adapters
https://support.apple.com/HT210133
"You can use any of the adapters listed below to charge your iPhone, iPad, Apple Watch, or iPod. You can also use third-party adapters that comply with applicable safety standards."
That list includes even a quite old model 5W charger. The main difference is a 5W charger will take longer to charge an iPad for which a 20W charger was supplied.
You can use any Apple charger with the phone; some of those chargers may charge the phone more slowly.
~Lyssa
It sounds like nonsense to me
It was frustrating that the support person from Apple was telling me obviously wrong information, stating that the USB-C adaptor was 20V when it’s actually 20W.
using older model chargers with iPhone 12
