Firmware update MagSafe Battery

The firmware update begins automatically after you attach your battery pack to your iPhone. The firmware update can take about one week.

To update the firmware using a Mac or an iPad model with a USB-C port, detach the battery pack from your iPhone, plug one end of a Lightning to USB cable into the Lightning connector on your battery pack, and the other end into your Mac or iPad. The firmware update will take about 5 minutes.

How to use your MagSafe Battery Pack - Apple Support

Good afternoon Francis 1188,

Welcome to the Apple Support Communities!

We'd like to help with the question you asked about how to update the MagSafe Battery on your iPhone 13 mini.

It appears you have viewed the How to use your MagSafe Battery Pack article which explains:

"To update the firmware using a Mac or an iPad model with a USB-C port, detach the battery pack from your iPhone, plug one end of a Lightning to USB cable into the Lightning connector on your battery pack, and the other end into your Mac or iPad. The firmware update will take about 5 minutes.

You can check that the update is complete on your iPhone in Settings > General > About > MagSafe Battery Pack. The Firmware Version will be 2.7"

If this isn't working for you, reach out to Apple Support for more guidance.

Take care.