Battery Health drainage in 11 Pro

Few weeks ago, everything was going good. My battery health was 86%. Don’t know why my IPhone 11 pro starts heating up during charging and its battery health reduced to 82% in just 3 weeks. Can anyone let me whats going on with it as I am using Apple 20 watt charger with it. Then whats the problem and what should I do?

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Battery Health drainage in 11 Pro
 
 
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