iPhoneのバッテリー容量
https://9to5mac.com/2020/04/16/iphone-battery-life-compared/
iPhone XS Max 3174 mAH
iPhone 11 Pro Max 3969 mAH
iPhone 14 Pro Max：4323mAh
https://news.yahoo.co.jp/articles/b5234c567595d512beaa8145307c3751d5c4fd7f
駆動電圧3.8Vとすると
11 Pro Maxは 15Wh
とはいえ実際には15Wの充電器で1hで終わるわけではない
iPhone SE（第2世代）は18W充電器を用いると30分早くフル充電可能 - iPhone Mania
https://www.ifixit.com/Teardown/iPhone+X+Teardown/98975?utm_content=buffer7537a&utm_medium=social&utm_source=twitter.com&utm_campaign=buffer
バッテリー容量は10.35Wh(2,716mAh)
This phone is packing a 10.35 Wh (2716 mAh at 3.81 V)
x V * 2.7 AH = 10.35Wh
リチウムイオン電池
バッテリー - なぜリチウムイオンなのか？ - Apple（日本）
SOLVED: Correct Battery Operating Voltage (Leak?) - iPhone - iFixit
A Li-ion battery has a nominal voltage of ~3.7V…that means this is the normal operating voltage. It is hardly a failed battery when it is at 3.8V. A fully charged battery will be ~4.2V.
https://gyazo.com/540e131ec81205482956fa0f5e90b495