Built-in protection circuit (PCM) prevents over charging/discharging.
Sony WH-1000XM5 Wireless Headphone Battery Replacement - 3.7V 1200mAh
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Sony MDR-1000X, WH-1000XM2 Headphone Battery - 4-296-914-01 SP-73 1200mAh
Sony MDR-10RBT MDR-ZX750BN MDR-ZX770BN Headphone Battery - 3.7V 300mAh US342243
Sony NC-4WM Walkman WM-507 WM-WX1 Wireless Remote Gumstick Battery - 1.2V 800mAh
Battery for Sony Wireless Headphones WH-1000xM3 3.7V 1000mAh
