Battery drain
my battery drains very fast even drains while phone is shut off and phone says screen on time is correct but says screen is off 0 minutes does that mean it is still on but black I have replaced the battery same problem
iPhone 8, iOS 13
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Take a look at this, iPhone Battery and Performance - Apple Support and this, About the battery usage on your iPhone, iPad, and iPod touch - Apple Support. As far as the battery draining after you have turned the phone off, that may indicate there is a problem with the battery itself. However, generally battery draining is usually a device specific issue. After an iOS update, it can take the iPhone 24-48 hours to reindex files and will use a great deal of battery. That will usually settle down after that. Another cause would be a process that is attempting to finish and has gotten stuck. A force restart of the iPhone will generally settle that down. You can try force restarting the iPhone and see if that helps. Force restart iPhone - Apple Support