Amazon.com: XUNNENG Replacement Battery Part No.4-296-914-01, SP73, SP-73 for Sony SRS-BTS50, WH-1000XM2, 1050mAh/3.89Wh, Portable Speaker Battery : Health & Household
Suitable for WI-1000XM2 Bluetooth headset battery 3.7V 290MAH lithium battery full capacity charging with protective plate - AliExpress
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CameronSino Battery for Sony WH-1000XM2 SRS-BTS50 MDR-1000X MDR-1ABT MDR-1ABT MDR-1ADAC fits Sony 4-296-914-01 Speaker Battery - AliExpress