Lithium-ion polymer battery
*Huawei conducted tests with a prototype of the HUAWEI FreeBuds 4i earbuds and the accompanying software using the HUAWEI P40 phone.
**Music playback test: The earbuds were connected to the phone over Bluetooth for music playback in the AAC format with the volume set to 50%. The battery was completely discharged until the music stopped playing from one of the earbuds.
***Voice call test: The earbuds were connected to the phone over Bluetooth with the volume set to 50%. A voice call was then conducted until the voice could not be heard from one of the earbuds.
The battery life will vary depending on the device settings, usage, and other factors.