Smart charging case
How do I see the percentage of my smart charging case on my iPhone?
iPhone X, iOS 12
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Check the charge
When you attach your iPhone to your case, a charging status appears on the Lock screen. The status also appears when you connect the case to power or disconnect from power. If you already attached your iPhone to your case, look for the charging status in Today View on your iPhone.
Lock screen
Today View
Charge your iPhone with your Smart Battery Case - Apple Support