Trying To Stop The Quick Draining Of My Iphone.
My IPhone Draining Quick, Why? And My Battery Capacity🔋 Is 100%.
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See these two support documents.
Batteries - Maximizing Performance - Apple
About the battery usage on your iPhone, iPad, and iPod touch - Apple Support
Battery issues is generally an individual device issue. You can go to Settings>Battery, and see what app is using the highest percentage of your battery and start your troubleshooting there.