user guide ios 16.0.3

There is no display for the 'rate' at which your battery is charging.. The way you've worded your question makes me think you're looking for something like an amperage or wattage readout. You don't get that level of detail.

Hi kang4u,

It sounds like you'd like your iPhone to display the battery percentage. Is that correct? If so, then we recommend that you follow the steps here: Show the battery percentage on your iPhone or iPad

Next, we'd like to show you how to perform the recommended troubleshooting steps via the link above. Please click to open the link, then read through the steps in the section titled "Find battery percentage on iPhone 14 and other models with Face ID."

On iPhone 14 and other iPhone models with Face ID (iPhone X and later), the battery percentage appears in Control Center. Just swipe down from the top-right corner of your display.

With iOS 16, you can turn on the battery percentage so it appears in your status bar. Go to Settings > Battery, and turn on Battery Percentage.

The reason why we are recommending the steps above is because they will show you how to display the battery percentage on your device.

Please do not hesitate to reach back out to us if you have more questions.

Thanks for using the Apple Support Communities.

Cheers!

First of all, you need to update to iOS 16.2

Not sure what you mean by "rate of battery charge".