My friend's sister has used her iPhone 7 for 8 years. She never replace her battery because the concept of replacing batteries is strange to her. Why is her battery health percentage
How to replace iPhone 7 Battery in 3 minutes - YouTube
Replace the Battery of iPhone SE/6S Plus/6S/6 Plus/6/5S/5C/5- Dr.Fone
How To: Replace the Battery in your iPhone 7 Plus in 4 Minutes - YouTube