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Express Cards with power reserve
If iOS isn’t running because iPhone needs to be charged, there may still be enough power in the battery to support Express Card transactions. Supported iPhone devices automatically support this feature with:
A payment or transit card designated as the Express Transit card
Access cards with Express Mode turned on
When the side button is pressed, the battery icon shows that power is low, and text indicates that Express Cards are available to use. The NFC controller performs Express Card transactions under the same conditions as when iOS is running, except that transactions are indicated only with haptic notifications (no visible notification is shown). On iPhone SE 2nd generation, completed transactions may take a few seconds to appear on screen. This feature isn’t available when a standard user-initiated shutdown is performed.