{"product_id":"sennheiser-pxc-550-replacement-battery-37v-650mah-li-polymer","title":"Sennheiser PXC 550 Replacement Battery 3.7V 650mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSennheiser PXC 550 \/ MB 660 \/ EPOS ADAPT 660 — 3.7V Li-Polymer Replacement Battery (AHB413645PCT)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 650mAh Li-Polymer replacement battery for the Sennheiser PXC 550, MB 660, and EPOS ADAPT 660 wireless headsets. It fits all three models directly — same flat-cell form factor, same connector, same BMS communication profile. Replace it when your headset stops holding charge or cuts out during use.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePXC 550, MB 660, and ADAPT 660 share this cell:\u003c\/strong\u003e\n    All three headsets use the same flat Li-Polymer cell and internal BMS handshake protocol. The connector pinout, physical dimensions (45.44 × 33.84 × 4.30mm), and protection circuit are identical across the platform — one cell fits all three.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on the PXC 550. The BMS handshake completed cleanly, protection circuit tripped correctly at low-voltage threshold, and the base station accepted the pack without an error flag.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBase station first-cycle logging:\u003c\/strong\u003e\n    Dock the headset in the base station and allow a full uninterrupted charge before your first call. DECT headsets log the new cell during this cycle — without it, the base unit's talk-time estimate will 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 PXC 550 cuts out mid-call even with a new battery\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe PXC 550 runs active noise cancellation and a DECT radio simultaneously. That combined draw creates brief current spikes that a degraded or partially charged new cell may not sustain. The BMS reads the voltage dip as a low-cell condition and trips, cutting audio. A full first charge cycle before use brings the cell to its working voltage range and eliminates most mid-call dropout on a fresh replacement.\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 new Li-Polymer cell ships at storage voltage — typically around 3.6–3.7V — not at full charge capacity. The base station LED can show \"charged\" before the cell has actually completed a full cycle. The headset then draws down quickly because the cell hasn't been conditioned. Dock the headset for a complete uninterrupted charge cycle; after 3–5 full cycles, talk time stabilises at rated capacity.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43428120494170,"sku":"BWCS-SXC550SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43428120526938,"sku":"BWCS-SXC550SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43428120559706,"sku":"BWCS-SXC550SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SXC550SL-1.webp?v=1779934190","url":"https:\/\/batteryweb.com\/products\/sennheiser-pxc-550-replacement-battery-37v-650mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}