Hey mate, are you experiencing noticeable battery drain vs. normal or, are you only l concerned about why the percentage is so high?
Firstly, this might be causing by having static IP set in WiFi settings. Check your WiFi settings and change it to DHCP if it isn’t already.
If that doesn’t solve the issue, I’d consider rebooting the device. And, if you’re still concerned backup and reset the device.
Finally, if believe there’s a software bug or fault, consider contact Nothing support. https://nothing.tech/pages/contact-support