E4 Pro has three built-in batteries; one inside the charging case and one in each earbud. The battery inside the case is used to charge the earbuds, while the included Type-C USB-cable is used to charge the case.
Charging and play times
The earbuds can be used for approximately 6 hours on one charge at 50% volume, or around 4 hours with ANC and music. Including the charging case, you get up to 30 hours of total playtime before needing to recharge the case.
Each battery takes approximately 90 minutes to fully charge.
Charging methods
The E4 Pro case can be charged with a Type-C USB-cable, wireless charging is also supported. We recommend using the Sudio cable included in the package, however, other third-party Type-C USB-cables may be compatible too.
Battery level indicators
There is one LED-light that indicates the charging case's remaining level on the bottom of the case.
The LED lights up when the earbuds connect and disconnect to the case and when there is less than 25% battery remaining.
When inserting the charging cable to the case, the current battery level is displayed for 5 seconds followed by a blinking light, indicating that the case is currently charging.
In some cases, you can also read the battery level on your phone, such as iPhone or Android devices. The level shown is that of the E4 Pro earbuds, not the charging case.
Charging case (no cable inserted)
- White: 26-99% battery remaining
- Orange: 0-25% battery remaining
Charging case (with cable inserted and charging)
- White (fixed): 100% battery charged
- Orange/White blinking: 0-99% battery charged
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