Wireless phone charger magnet strength

[loki]

One nice difference I notice from the model x is that the wireless charger is strong enough to charge my phone that has a card case on it and 3 cards stacked inside. I wonder if I have to worry about demagnetization? It also gets the back pretty warm.

 

[Woodrick]

Wouldn't be my recommendation to have them there.

 

[loki]

At least we don’t swipe our cards any more.