iphone xr charger hot

It's normal that the charger gets hot while charging your iPhone.

It shouldn't be a normal behavior if the charger would get hot without having your iPhone connected.

For any doubts, if still on warranty, have your original chargers inspected at your most convenient Apple Store.

Please, remember to use always original or "MFI" certified accessories (MFI = Made For IPhone).

Regards

Giulio

There's no difference if the iPhone is ON or OFF while charging, and don't worry about overcharging it, 'cause the iPhone automatically stops charging when its battery reaches 100%.

I started using iPhones in 2009 and I've always charged them overnight, every nights, with iphones ON (sometimes in airplane mode, sometimes without airplane mode). Batteries lasted at least 2,5-3 years or even more, without any problem. The only precaution I've always adopted was (is) that I do not let the battery go down below 15-20%.

Keep also in mind that battery lifespan is measured in cycles:

1 cycle = complete charge from 0 to 100%

1/2 cycle = charge from 50 to 100%

1/4 cycle = charge from 75 to 100% ... and so on.

Regards

Giulio

You're most welcome, Peter. 🙂

Giulio