Magsafe Charger Slow Charging

Hey, Gio_1108.

Thanks for getting back to us. Are you using Optimized Battery Charging? Check out this for more details: If your iPhone or iPod touch won't charge

"If your device stopped charging at 80 percent

Your iPhone might get slightly warmer while it charges. To extend the lifespan of your battery, if the battery gets too warm, software might limit charging above 80 percent. Your iPhone will charge again when the temperature drops. Try moving your iPhone and charger to a cooler location.

iOS 13 uses Optimized Battery Charging to slow the rate of battery aging by reducing the time that your iPhone spends fully charged. Your iPhone uses on-device machine learning to understand your daily charging routine so that it can wait until you need to use your iPhone to finish charging past 80 percent.* Charging in this way reduces the wear on your battery and improves its lifespan. Optimized Battery Charging is active only when your iPhone predicts that it will be connected to a charger for a long period of time."

Also, be sure to review this article as well: How to wirelessly charge your iPhone

"Learn more

• Wireless charging uses magnetic induction to charge your iPhone. Don't place anything between your iPhone and the charger. Magnetic mounts, magnetic cases, or other objects between your iPhone and the charger might reduce performance or damage magnetic strips or RFID chips like those found in some credit cards, security badges, passports, and key fobs. If your case holds any of these sensitive items, remove them before charging or make sure that they aren’t between the back of your iPhone and the charger.
• If your iPhone isn't charging or is charging slowly and your iPhone has a thick case, metal case, or battery case, try removing the case.
• If your iPhone vibrates—when it gets a notification, for example—your iPhone might shift position. This can cause the charging mat to stop providing power to your iPhone. If this happens often, consider turning off vibration, turning on Do Not Disturb, or using a case to prevent movement.
• Depending on the charging mat you have, you might hear faint noises while your iPhone charges.
• Your iPhone might get slightly warmer while it charges. To extend the lifespan of your battery, if the battery gets too warm, software might limit charging above 80 percent. Your iPhone will charge again when the temperature drops. Try moving your iPhone and charger to a cooler location.
• Your iPhone won't charge wirelessly when connected to USB. If your iPhone is connected to your computer with USB, or if it's connected to a USB power adapter, your iPhone will charge using the USB connection."

Best wishes. 

Greetings, Gio_1108.

Welcome to the Apple Support Communities. We can understand why you’d want your iPhone to charge quickly. 

Check out: How to use your MagSafe Charger with iPhone 12 models 

We hope this helps! Thanks for being a part of the Apple Support Communities.

Sincerely.