iPhone 12 Pro charging slowly with Magsafe charger

To check if the problem is the MagSafe charger or the phone, try charging with a cable.

One point to note, wireless charging does have some energy loss that a direct cable connection does not, so a 15 watt wireless charger probably only provider 10-12 watts to the battery. A cable connection does provide all of it’s energy to the phone’s battery, so in a way it is “greener” as it has less energy waste.

Hi!

I removed from MagSafe and went direct to the USB 20w brick with USBC lightning cable and it was fast charging to 100% v sitting at 50%.

Pretty certain now it’s the MagSafe charger and the Case. I will be returning both if possible.

Also more that the Mag Safe charger was very warm when charging...

Thanks!

Apple says the magsafe charger is supposed to charge at 15W

The MagSafe Charger makes wireless charging a snap. The

perfectly aligned magnets attach to your iPhone 12 or iPhone 12 Pro and

provide faster wireless charging up to 15W.

Just left the Apple Store at Marina Bay. The Genius did a thorough check to my 12 pro and tried another MagSafe charger. It charged normally. So the outcome is the MagSafe charger I have is a defective unit. I've applied for a refund.

I would suggest anyone who has this issue to visit Apple Store, or just get a refund or exchange with the MagSafe charger.

I bought the MagSafe charger with the 20w brick today for my new iPhone 12 Pro. When I put the iPhone on it, I had 63% battery life. 15 minutes later I had 60% and I only used it to check the weather, etc a couple of time. Now it has dropped to 58% after another 15 minutes on the MagSafe charger.

I even shut the iPhone down and restarted but it is not charging at all and is in fact draining the battery.

What gives?

Dale Burmeister wrote:

What gives?

If you read the thread you posted to you will know what gives.

But to summarize, there are some defective MagSafe chargers in the pipeline. If you contact Apple support they will replace it.

How fast does the new iP 12 charge with your existing wireless charger compared to the new Mag Safe charger? I have a Mophie 7.5w and it charges my iP 11 Pro Max faster than what you are reporting for the iP 12 + Mag Safe. Do I sense a "Chargergate" brewing?

The MagSafe is 15 watts, so it will charge twice as fast as a 7.5 watt Qi charger to 80%. From 80% to 100% there is no fast charge capability; the phone slows the charge rate above 80% (actually, it starts slowing at 75%) to prevent overcharging.

However, there appears to be a bad batch of MagSafe chargers (or possibly 20 watt USB-C power sources) in the pipeline. Contact Apple Support to arrange to get it replaced—>Get Support

Except I saw an article that the Mag-Safe uses a new 15watt PD Profile and currently only the genuine Apple 18 or 20 watt charger supports it.

https://appleinsider.com/articles/20/10/27/magsafe-15w-fast-charging-restricted-to-apple-20w-adapter

Device: iPhone 12 Pro, 256 GB, Pacific Blue

iOS 4.1

Alright so... I received my iPhone 12 Pro and after initial setup realized I was having the same issue. During setup while apps were being downloaded I even noticed that while MagSafe charger (Using new 20W Brick) was attached to device, it said it was charging but noticed it wasn’t actually charging. The percentage was going down... I also noticed after trying a number of things that after I hard reset the device, the percentage shoots up as if it actually was charging all along... but then goes back to being buggy again. During this time I also noticed that while the MagSafe was attached, the iPhone 12 Pro was getting VERY HOT. 🥵 I’ve tried everything multiple times, from backing up and resetting and erasing device, to hard resetting multiple times, to setting up as new device...

After fiddling with the device and reading multiple forums on the issue, I came across another interesting bug... which leads me to believe it’s actually a software issue and not a hardware issue. If you go to the ‘Measure’ App, the Lidar scanner is supposed to automatically be used to indicate how tall someone is... but it wasn’t working. It either kept saying move closer or move further away. So I found a solution to that problem on another forum... and it seems that this solution also solved the wireless charging issue as well. It’s simple actually.

The ONLY solution that I found was the following (No need to setup as new phone):

Go to: Settings>General>Reset>Reset All Settings. (No need to erase your phone.)

This seems to have solved the issue. I would also try charging and discharging the battery once or twice with a lightning cable first. This seems to have resolved the wireless charging problem we’re all experiencing. Hopefully this helps. I still made an appointment with Apple so I’ll update to see what they say.

Good luck everyone.

Also - MagSafe Charging may not be as fast as you expected. Checkout this article:

https://www.phonearena.com/news/apple-iphone-12-pro-magsafe-vs-20w-vs-18w-vs-5w-charging-speeds_id128110

That’s actually a very different issue; most of the reports in this thread say it is only a problem with the MagSafe charger. What are you using as a power source when plugging it in? As a minimum it should be a 12 watt “iPad” power source; better is an 18 watt USB-C, best is a 20 watt or higher USB-C.

I just updated my iphone 12 Pro to ios 14.2, and tried the Magsafe charger again from the 75% level. It initially charged quite fast say 17% more in 30 min, then it started to charge slower and took almost an hour to add 25 % new charge to reach 100% level. This time the phone was not as warm as when it was in ios 14.1. There is little improvement, but charging still slow.

It doesn’t matter what kind of charger you use. The charge rate always slows down after the phone reaches 75%. But a 20 watt USB-C charger will always be faster than a 15 watt wireless charger. Both because it can supply 1/3 more power, and because wireless charging is less efficient than wired.

The charge rate is completely under the control of the phone; the power source plays no part in any charge rate decisions, other than the fact that the phone can’t use more energy than the power source supplies.

If you follow the best practice of charging overnight, every night, the charge rate won’t matter, because the phone will always be fully charged in the morning. And unless you are a very heavy user it will last for the day.