You can check the battery level of the Air Buds+ earbuds on your smartphone. Go to the notification bar and look at the Bluetooth icon. The battery level is mentioned under it. You can also check the battery level of the charging case on the case. White LED flashing quickly for 3 seconds indicates battery level at less than 10%, white LED flashing slowly for 3 seconds indicates battery level between 11-30%, and solid white LED for 3 seconds indicates battery level between 31-100%.