Edit: This appears to no longer exist for me on the August hotfix. Thank you all for your feedback!

On the Android 15 Beta you can get to this page by visiting Settings > System > Device Diagnostics > Component Health > Battery Status

I think my question for you all is anyone’s percentage reported as less than 100%? I do have a relatively new phone (Pixel 8 Pro) but after 136 charge cycles I would expect to lose a percentage point or two so I was just seeing if anyone had different stats.