I Phone 11 Pro showing wrong percentage
So my IPhone suddenly started showing the wrong percentage, this has been going for 3 to 4 days now and I have tried everything from charging it to 100% or draining the battery completely and leaving it like that for 30 minutes. Is there a way to solve this?
An example of the problem is when I charge my phone to 100 and open an app, after 5 minutes of use it suddenly goes to 20%, then after 5 more minutes it goes to 1% but I can still use it for 5-6 hours
iPhone 11 Pro, iOS 14