{"product_id":"sony-bf-tdsy-replacement-battery-12v-700mah-ni-mh","title":"Sony BF-TDSY Wireless Headset Compatible Battery 1.2V 700mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSony MDR-DS3000 \/ MDR-DS4000 Series — 1.2V Ni-MH Replacement Battery (1-756-316-21)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 1.2V 700mAh Ni-MH cell that replaces the original rechargeable pack in Sony wireless headsets. It fits the BF-TDSY, MDR-DS3000, MDR-DS4000, MDR-IF140, and over 20 additional compatible models. When the original cell degrades and the headset stops holding charge, this cell restores full function without replacing the entire headset.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMulti-model fit across the Sony wireless headset range:\u003c\/strong\u003e\n    These headsets share the same 1.2V Ni-MH cell format, connector pinout, and base-station charging circuit. The BMS handshake is consistent across the MDR-DS and MDR-IF lines, so the same cell works across all listed models without modification.\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 a Sony MDR-DS3000 base station. The BMS accepted the new pack without error, completed a full charge cycle, and the headset registered correct charge status on the base unit display.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle base station registration:\u003c\/strong\u003e\n    Place the headset in its base station and allow a complete charge cycle before making any calls. DECT headsets log the new cell during that first full cycle — skipping it causes the base to display inaccurate talk-time estimates from the start.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBase station not recognising a new pack after cell replacement\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eSony DECT base stations run a handshake with the headset's cell during the first charge. If you seat the headset and the base shows a charging error or no charge indicator, the BMS has not completed initialisation. Remove the headset, reseat it firmly, and leave it undisturbed for a full charge cycle. The base station needs sustained contact to log the new cell — interrupting the first cycle resets the process.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eHeadset cutting out mid-call on a freshly charged battery\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when a new Ni-MH cell has not yet reached full capacity through conditioning. On the first few cycles, the cell delivers less than its rated 700mAh because the nickel-metal hydride chemistry needs repeated charge and discharge passes to activate all available capacity. The DECT radio and audio circuit together draw enough current to expose this shortfall as a voltage sag, which triggers the headset's low-battery cutoff. Run three to five full charge and discharge cycles and the cutoff point will shift back toward the rated capacity.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43428158341210,"sku":"BWCS-SRF820SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43428158373978,"sku":"BWCS-SRF820SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43428158406746,"sku":"BWCS-SRF820SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SRF820SL-1.webp?v=1779934292","url":"https:\/\/batteryweb.com\/products\/sony-bf-tdsy-replacement-battery-12v-700mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}