MOBILOTEC Akku kompatibel mit Philips SBC-HB550S NiMH Akku, NiMH, 2x1.2 Volt, 750 mAh | MediaMarkt
9pcs/lot TrustFire 18650 Protected Rechargeable Batteries 3.7V 2600mAh Lithium Li ion Battery For Led Flashlights with PCB|Replacement Batteries| - AliExpress
Как заменить фирменные аккумуляторы Philips sbc hb550s в наушниках на обычные
Headphones Use Standard-sized But Proprietary Rechargeable Batteries | Hackaday