{"product_id":"hp-bluetooth-stereo-headphones-replacement-battery-37v-500mah-li-polymer","title":"HP FA303A#AC3 Bluetooth Headphones Compatible Battery 3.7V 500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eHP Bluetooth Stereo Headphones — 3.7V Li-Polymer Replacement Battery (FA303A#AC3)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 500mAh Li-Polymer cell replaces the original battery in the HP Bluetooth Stereo Headphones (FA303A#AC3). It restores wireless audio and call functionality when the original cell has degraded through repeated charge cycles. Capacity is sourced directly from product specifications at 500mAh (1.85Wh).\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFA303A#AC3 and 365830-001 compatibility:\u003c\/strong\u003e\n    Both OEM part numbers reference the same physical cell format — 42.13 x 30.00 x 4.20mm footprint, 3.7V nominal, with the same connector orientation and BMS communication requirements. Swapping either number lands you on the same replacement cell.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the HP headset's charging circuit and confirmed BMS handshake completion, stable cutoff at 4.2V charge termination, and correct low-voltage protection trip below 3.0V under combined audio and Bluetooth radio draw.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst charge in the base station:\u003c\/strong\u003e\n    Seat the headset in the HP base station and run a complete charge cycle before taking a call. The base station needs that full cycle to log the new cell's state-of-charge curve — skipping it causes the talk-time indicator to read inaccurately for the first several uses.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the HP headset cuts out mid-call after a battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe HP Bluetooth Stereo Headphones draw simultaneously from the audio amplifier and the Bluetooth radio during a call. A fresh Li-Polymer cell at partial state-of-charge can't sustain both loads without a brief voltage sag. If that sag dips below the BMS undervoltage threshold — typically around 3.0V under peak draw — the protection circuit trips and cuts power. Running two or three full charge-discharge cycles conditions the cell and stabilises its internal resistance, which reduces sag under combined load.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBase station shows full charge but headset shuts off after a few minutes\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA replacement cell shipped at storage voltage (around 3.7V) can fool the base station's charge controller into reading a full charge prematurely. The base sees voltage in the normal range, stops charging, and reports 100% — but the cell hasn't completed a proper formation cycle. Place the headset in the base, leave it for a full uninterrupted charge, and confirm the charging LED completes its full sequence before removing the headset. After that first complete cycle, the base station accurately tracks state-of-charge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43428156571738,"sku":"BWCS-HPB303SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43428156604506,"sku":"BWCS-HPB303SL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43428156637274,"sku":"BWCS-HPB303SL-3","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HPB303SL_1.webp?v=1779934277","url":"https:\/\/batteryweb.com\/products\/hp-bluetooth-stereo-headphones-replacement-battery-37v-500mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}