My iPhone 7 battery

Hi there GeoffdeF,

Thanks for joining us in Apple Support Communities! From what we can tell, your iPhone battery is not holding a charge and it's powering off unexpectedly. We're glad you're here, and we'd like to learn more to see how we can help.

To begin, what do you see listed for Maximum Capacity in Settings > Battery > Battery Health? Have a look at the 'Battery Health' section here to learn more:

iPhone Battery and Performance

You'll also want to review the information in the 'Preventing unexpected shutdowns' section of the link above.

Let us know how it goes.

Cheers.

Geoff ~ If your iPhone 7 still has its original battery, it likely needs replacement:

iPhone Battery & Power Repair

...found by searching Apple's Knowledge Base.

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