{"product_id":"sony-wh-1000xm3-replacement-battery-37v-1000mah-li-polymer","title":"Sony WH-1000XM3 Replacement Battery 3.7V 1000mAh SP624038","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSony WH-1000xM3 \/ WH-XB900N Series — 3.7V Li-Polymer Replacement Battery (SP 624038)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1000mAh Li-Polymer battery for the Sony WH-1000xM3 wireless headphones and compatible models in the WH series. It restores power to headphones where the original cell has degraded, stopped holding charge, or failed entirely. Fits WH-1000xM3, WH-CH710N\/B, WH-XB900, and WH-XB900N using OEM part numbers SP 624038, SM-03, 1588-0911, and LIS1662HNPC.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWH-series compatibility:\u003c\/strong\u003e\n    These models share the same 3.7V single-cell Li-Polymer architecture, connector pinout, and BMS handshake protocol. Sony consolidated the power design across this headphone range, so the same cell works across all four models without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this battery in a WH-1000xM3 unit and confirmed the BMS completed its handshake on first charge. The protection circuit responded correctly to both over-charge and over-discharge cutoff thresholds during testing.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle charge protocol for WH headphones:\u003c\/strong\u003e\n    Place the headphones on the USB-C charge cable for a full, uninterrupted charge before use. The WH-1000xM3 firmware reads cell state during the first charge cycle to calibrate the battery indicator — skipping this causes the charge display to read inaccurately for the first week of use.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the WH-1000xM3 cuts out mid-call on a new battery\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe WH-1000xM3 runs three simultaneous loads during a call: Bluetooth radio, active noise cancellation DSP, and microphone processing. On a freshly installed cell that hasn't completed its first full cycle, the resting voltage sits around 3.6–3.7V and sags under combined draw. The BMS interprets this sag as a low-cell condition and triggers a protective cutoff before the cell is actually depleted. Running two or three full charge-discharge cycles brings the cell to rated capacity and eliminates the sag that causes the dropout.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery indicator stuck at full — then headphones cut off without warning\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the replacement cell arrives at storage voltage (typically 3.6–3.7V) and the firmware reads that as a near-full state without a calibration cycle. The indicator shows full because no discharge reference point exists yet. The headphones then shut off abruptly once the cell hits the BMS low-voltage cutoff, with no warning from the indicator. Fix this by running one complete charge from flat to full via USB-C, which lets the firmware establish accurate low and high voltage reference points for the indicator.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43428123672666,"sku":"BWCS-SWH100SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43428123705434,"sku":"BWCS-SWH100SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43428123738202,"sku":"BWCS-SWH100SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SWH100SL-1.webp?v=1779934191","url":"https:\/\/batteryweb.com\/products\/sony-wh-1000xm3-replacement-battery-37v-1000mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}