I'm using iPhone 11 Pro Max. I've tried various wireless chargers that come with fast charging on their label, even the Magsafe charger for the iPhone 12 I'm running a test of how many percent it will add if I charge it in 10 minutes with Waze/Google Map on. I connect it to a 20w car charger. I disabled optimized battery charging on iPhone. Of all the chargers I've tried, this is the fastest, it doesn't charge very fast but it's faster than all the wireless car chargers I've tried. Most of them are well-known brands of car fast chargers. I think it's just that the iPhone 11promax isn't very compatible with their wireless chargers. But if you want fast charging just use a cable, but if you want a decent cheap one that won't drain your battery when using Waze/Google Maps. FYI I bought a metal ring plate on the back of the phone to attach to the charger. The iPhone 11, unlike the 12, does not have a metal ring. And don't place any solid metal plate in the middle of the phone, it will block wireless charging. I will UPDATE you if anything goes wrong in the future.
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