Battery

Hello honore194,

Welcome to Apple Support Communities! We understand your concern with receiving this alert about your battery. We're happy to assist you with this.

Check your battery health by navigating to Settings > Battery > Battery Health.

“A normal battery is designed to retain up to 80% of its original capacity at 500 complete charge cycles when operating under normal conditions.: iPhone Battery and Performance

This message also can just be a battery tip. Updating your iPhone will temporarily use more of your battery, but should return to normal once everything downloads and fully index.

This article includes lots of great information along with multiple tips to help you maximize your battery life. Maximizing Battery Life and Lifespan Tips for iPhone, iPad, and iPod touch - Apple Support

Best Regards.

Hi honore194,

We're glad we were able to help ease your concerns. Thanks for working with us here in Apple Support Communities!

Have a wonderful day.