Plantronics Calisto 620 Spare Battery – For Speakerphone – Battery Rechargeable – 3.7 V DC – 930 mAh – Lithium Polymer (Li-Polymer) – Wulus
Original Losoncoer 1200mah Battery For Plantronics Calisto 620 Battery 620-m,620s 89305-01,85442-01 85442-0 Bluetooth Headset - Digital Batteries - AliExpress