As soon as I disconnect the phone from the charger the battery flashes and goes blank. If your iPhone is still refusing to charge even when it says it is try using a different Lightning cable.
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Apple does bring forth one more remedy to an iPhone or iPad that died and wont turn on even when its fully charged.

What to do if your iphone wont turn on but says its charging. A wall charger laptop. Press and hold the side button until you see the Apple logo. If your phone wont turn on follow these steps to check your hardware and charge your phone.
Press and quickly release the volume down button. A hard reset will force your iPhone 12 to turn off and back on abruptly. To perform a hard reset on the iPhone 12 press and release the Volume Up button then press and release the Volume Down then press and hold the side button until your screen.
There are four key components of the charging process. Force Restart Your iPhone. Try to charge the device using a different power adapter andor USB cable if needed.
I connected it to a charger and it showed the charging symbol but it has now been two hours and the phone will not turn on. Connect your device to the computer open iTunes or Finder put the phone into recovery mode do a restore and done. Fix iPhone X Wont Turn On with AnyFix.
Contact Apple to see why iPhone 12 wont start up. If your iPhone is not charging because of software issues you can view these top methods for fixing this problem. Press and hold the side button until you see the Apple logo.
Use a hair dryer on high setting for about 30-60 seconds. Your iPhones software your charging cable your charger and your iPhones hardware. Find A Repair Shop near You.
If your device still wont turn on or charge take your device charging cable and charging adapter to an Apple Store or Apple Authorised Service Provider for evaluation. On an iPhone 8 or later including iPhone SE 2nd generation Press and quickly release the volume up button. It sounds obvious we agree but the first thing to check when the iPhone SE is overheated and wont turn on is the battery.
Check iPhone SE Battery. Its possible that your iPhone 12 is charging but a software problem has made the screen black. I have an iPhone 4s.
Right now we cant be sure which is preventing your iPhone 11 from charging. If your phone still doesnt turn on contact Apple Support. If your phone doesnt turn on follow these steps to check your hardware and charge your phone.
When one of these things fails to do its job your iPhone 11 wont charge. If your phone doesnt turn on follow these steps to check your hardware and charge your phone. You may need to charge for up to an hour.
Press and hold both the Home button and the side button or the top button until you see the Apple logo. There is a slight possibility that the battery is drained. AnyFix iOS System Recovery is a reliable system repair tool which can help you fix 150 iPhone system issues like iPhone wont turn on iPhone is disabled Apple logo etc.
After charging the iPhone may turn on automatically. You can also contact Apple Support. When iPhone 11 wont turn on after having it charged through the night check to see if the charger lightning cable USB port are.
Then KNOWING THIS WILL RUIN YOUR WARRANTYINSURANCE ETC 1. If your warranty is no longer valid your best bet is to find a reputable repair. It will get very hot.
Fix iPhone Says Its Charging But Its Not Due to Software Issues. Let your device charge for another half hour. Many times the iOS issues including the charging issues automatically get fixed by just force restarting your device.
Restore from recovery mode. Earlier i was using it when the battery died. You can also contact Apple Support.
Plug the iPhone in the charger and let it charge for at least 15 to 30 minutes. In most cases the problem is usually the charging port if the device wont charge or a variety of hardware issues if the device wont turn on. Put the screen side down on the floor.
On your iPhone 8 or later including iPhone SE 2nd generation Press and quickly release the volume up button. While youre at it try a different charging too. If Your iPhone SE Still Wont Turn On.
Unplug your iphone completely and remove cover. There could be an issue with your Lightning cable not your iPhone. Press and quickly release the volume down button.
If your device still wont power on or charge take your device charging cable and charging adapter to an Apple Retail Store or Apple Authorized Service Provider for evaluation. It turned on twice for a few seconds and died again. Insufficient power or a completely drained battery would be a good way to explain why iPhone is not turning on at all so plug it into a charger and let it charge for at least 30 minutes and with any luck your iPhone powers on itself.