Here is the forum : [FiiO BTR5/FiiO BTR5 2021] Flagship Portable High-Fidelity Bluetooth Amplifier, Bluetooth chip CSR8675, support up to 384kHz&DSD256 native | Page 104 | Headphone Reviews and Discussion - Head-Fi.org
So what do you think is the problem with mine , Iām just getting 2.5 h of battery life ?