Is iPhone draining car battery?

Question

If you plug your smartphone into your cars usb cable which is part of the stereo system I believe, I guess it’s charging itself whilst plugged in.
Obviously you should not leave it in accessory mode as it will drain overtime.
But what about when running?  Is the smartphone draining to the point the alternator can’t replenish etc and so one should not attach phone to car, or is the alternator recharging the battery when running regardless of iPhone use.
Thanks

Solar Mike · Accepted Answer

Yes, the smartphone takes power from the socket when it is powered.
However if you check the demand of the smartphone in W and AH then you will find it is very small compared to the car battery capacity and the alternator output. Check the units: car battery in AH and smartphone mAH...
If you have a car battery going flat it is due to one, or both, of two things:

something is left on (lights etc, even interior or boot light)

a failing battery - common with older batteries.

So, in short, if the battery is going flat, you have a problem to find but it won’t be the smartphone.

Is iPhone draining car battery?

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