{"product_id":"sony-wi-c600n-replacement-battery-37v-130mah-li-polymer","title":"Sony WI-C600N Replacement Battery 3.7V 130mAh Li-Polymer","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSony WI-C600N \/ WI-C400 \/ WI-C500 Series — 3.7V Li-Polymer Replacement Battery (1-001-274-31)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 130mAh Li-Polymer cell that replaces OEM part 1-001-274-31 in Sony WI-C series wireless earbuds. It fits the WI-C600N, WI-C400, WI-C500, and WI-C200, among others. The cell restores audio playback and active noise cancellation to earbuds whose original battery has degraded from repeated charge cycles.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWI-C series shared cell platform:\u003c\/strong\u003e\n    Sony's WI-C lineup uses the same compact 37.20 × 10.40 × 4.40mm Li-Polymer cell across multiple models. The shared voltage rail and connector spec mean a single replacement cell covers the range — no wiring modification needed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on WI-C series hardware. The BMS accepted the new pack cleanly, completed the charge cycle without error flags, and noise cancellation drew current as expected without triggering any protection cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle logging on WI-C earbuds:\u003c\/strong\u003e\n    After fitting a new cell, run one complete charge before using ANC. The earbud firmware tracks cell state from the first full cycle — skipping this means the noise cancellation circuit may throttle draw early until the battery management system has a calibrated baseline.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy ANC draw shortens cycle life faster than audio-only use\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eActive noise cancellation runs its DSP and microphone circuit continuously alongside the audio path, pulling a sustained combined load from a 130mAh cell. That sustained draw generates more heat in a compact housing than audio alone. Heat accelerates electrolyte degradation in Li-Polymer cells at this capacity. If ANC is not needed, switching to standard mode preserves more charge cycles over the battery's life.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eEarbuds cut out mid-playback despite showing charge remaining\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the combined audio plus ANC draw creates a brief voltage sag that crosses the BMS low-voltage cutoff threshold — even if the displayed charge level looks healthy. At 130mAh, the cell has little headroom to absorb a sudden load spike. The BMS trips as a protection response, not because the cell is empty. Confirm cell voltage reads at least 3.7V with the earbuds powered off; if it reads below 3.5V after a full charge, the replacement cell needs one more full conditioning cycle before voltage stabilises.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43428097917018,"sku":"BWCS-SWC310SL-1","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43428097949786,"sku":"BWCS-SWC310SL-2","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43428097982554,"sku":"BWCS-SWC310SL-3","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SWC310SL-1.webp?v=1779934086","url":"https:\/\/batteryweb.com\/products\/sony-wi-c600n-replacement-battery-37v-130mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}