Cameron Sino 650mah Battery Pr-423350 For Plantronics K100, Lis1427hepcc, Lis1427nhpcc For Sony Mdr-ds6500, Mdr-xb950bt - Digital Batteries - AliExpress
New 3.7V 700mAh Li-Polymer Battery Suitable for Sony DP-RF6500, MDR-DS6500 headset battery Rechargeable Replacement LIS1427HNPCS - AliExpress Consumer Electronics
Sony MDR-DS6500 Battery| 650mAh Li-Polymer Headset Battery – NextBatteries.com