No, the Slim EX3 Wireless Keyboard does not support the battery percentage feature on macOS that the Apple Magic Keyboard or Mouse uses. macOS may show about 60% even when the keyboard is fully charged.

The Slim EX3 Wireless Keyboard uses the power LED indicator to show battery status:

• Flashing red: low battery (below 15%)
• Solid red: charging
• Solid green: fully charged

To charge, connect the keyboard to a computer or USB-C wall adapter (5W or greater) with the included USB-C cable. Charge for 2 to 3 hours, or until the red charging LED turns green.