Is it safe to charge an iPhone15 Pro via USB-C and with a MagSafe car charger simultaneously?
I just purchased a magnetic phone holder/wireless charger made by Celly (GHOSTSUPERMAGCH)). It is capable of inductively charging a phone with up to 15W power from a QC 3.0 power supply (which is in my case plugged into my car's cigarette lighter type 12 V outlet). For just charging and holding securely the phone, this is very handy and I wish to keep the Celly connected to the car electricity all the time so that my phone could always receive a charge when placed on the MagSafe holder/charger.
The Apple CarPlay implementation in my car only supports iPhones via a USB-A connection (BT is not possible in my 2018 car). Its USB-A interface also powers and charges the phone when connected and I do not think I could disable its charging function in any way.
I would of course like to avoid every time connecting and disconnecting the iPhone when I wish to use the CarPlay system, to avoid damage to or premature wear of the phone's USB-C connection (the USB-A/USB-C cable always stays in the car, so I disconnect it at the phone end). But as a Bluetooth connection with the CarPlay system is impossible, I must re-connect the cable whenever I wish to use the CarPlay!
It would of course be nice if I could just place the phone on to the MagSafe holder/charger and use BT to connect to CarPlay while the MagSafe holder feeds power to and charges the phone as necessary.
When I connect my iPhone to the CarPlay e.g. for navigation - and if it is placed onto the MagSafe holder/charger which is live (i.e. connected to car electricity) - then there are 2 independent charging channels available for my iPhone 15 Pro to use simultaneously. And the phone would most likely want to recharge itself if the battery is less than 100%. I could imagine that it would try to draw current from both sources.
This double-charging situation is entirely possible, but is it safe? Can it damage the phone or its battery??
Of course I could always disconnect the MagSafe charging cable when I like to use the CarPlay. But it is entirely possible to forget to do that. Therefore, it's a good idea to know what happens from the battery charging point of view in this situation.
Thanks already for an answer!
iPhone 15 Pro, iOS 17
