F4 has one built-in battery inside the speaker.
Charging and play times
The speaker can be used for approximately 25 hours on one charge.
The battery takes approximately 3 hours to fully charge. F4 does not support quick charge.
Charging methods
F4 can only be charged with a Type-C USB-cable. 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 (no cable inserted)
- White light blinking every 5 seconds: 0-10% battery remaining
Battery level indicators (with cable inserted and charging)
- White (fixed): 100% battery charged
- White blinking: 0-99% battery charged
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