iPhone 12 Pro charging slowly with Magsafe charger

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 got same problem. In the first day, the magSafe only charged my iphone 12 Pro to 80%, which I did not know the reason. Until I put the phone under a fan and charged overnight, I noticed it was the heat problem. The battery was charged to 80% and stopped. Then the battery temperature was cool down after few hours. When the temperature was low enough, the charging activity was re-started again. This will shorten the battery life and I cannot always put my phone under a fan. Apply claimed that it was optimized...it is clearly to cover the heat problem. I recommend to return back the magSafe back to Apple as it will kill your battery.

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!

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.

so due to heat concerns it does lower the wattage over time... i’ve found to help reduce this, not completely get rid of it because that would be dangerous, turn off optimized charging. Again this doesn’t fix it but it does help, also i’d recommend using a normal cable to charge throughout the day, or if you don’t need your phone at the current time use the magsafe, or if your just looking for a little bit of power to get you through the day. This charger, without optimized charging, will get it to 100% overnight, but during the day you will find after about 20-25% it gets noticeably slower.

Go to Settings/Battery/Battery Health. Is Optimized Battery Charging turned on? If it is the phone is supposed to stop at 80% if you charge it over night (and you should), then resume automatically to reach 100% at the start of your day after it learns your usage pattern. If you don’t plan to charge overnight turn off this feature.

It will also stop at 80% to cool off if you fast charge it; then it resumes at a much slower charge rate to avoid overcharging. It can take an additional hour or two going from 80% to 100%.

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.

I do not think it is the case issue. I suspect it has to do with the MagSafe itself. I already returned my MagSafe to Apple and just use the Apple 20W charger block and the USB-C cord to plug in the iphone. It took about 2 hrs to charge from 20 to 100% with no heat.

Your magsafe may be defective. A number of them seem to be. Contact Apple support.

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.

dr.jvoss wrote:

Also if I am on face time the app slows down then crashes after 25-30 minutes. The phone totally overheats

If you have updated to iOS 14.2 and see the same issue, you may want to think about returning your phone if you it's been less than 14 days since purchase for a refund as it may be unsuitable for you, for whatever reason.

If you're past the return window, contact Apple Support directly and they can help you take next steps towards an exchange or take other steps to help solve your issue.

Contact - Official Apple Support

I bought the exact same products and my IPhone12 Pro was overheating when charging overnight and was charging very slowly. At one stage it drained the battery. I took the MagSafe back and it tested faulty. The replacement is not overheating but does get warm and is still very slow charging. The Alarm Clock app I use overnight seems to make the issue worse.

Yea the mag safe imo it's not worth it. It's slow as all **** and it gets hot very quickly. You're much better off using the wire charger which is a LOT faster.