Greetings JithinChowdary,
Thanks for visiting the Apple Support Communities! It seems your iPhone isn't charging past 80%.
Check to see if Optimized Battery Charging is enabled. You can see that outlined in the following article:
If your iPhone or iPod touch won't charge - Apple Support
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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."
Kind regards.