2 x OEM M1454S2 3.85V Battery For QuietComfort Earbuds II QC II QC Ultra 0.404Wh
Battery Model: M1454S2. 2 x Bose M1454S2 3.85V 0.404wH Batteries. This is for the 2022 QC II model Bose QC Ultra earbuds. Make sure the lip of your earbuds case says the model 435911 or 441408 on it.