{"product_id":"logitech-pure-fi-anywhere-speaker-1st-replacement-battery-37v-3000mah-li-ion","title":"Logitech NTA2479 Pure-Fi Anywhere Speaker 1st Replacement Battery 3.7V 3000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLogitech Pure-Fi Anywhere 1st Gen \/ MM50 — 3.7V Li-ion Replacement Battery (NTA2479)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 3000mAh Li-ion cell built to the NTA2479 spec, fitting the Logitech Pure-Fi Anywhere Speaker 1st generation and MM50. Both models share the same battery bay, connector, and BMS handshake. Swap it in when the original cell no longer holds a charge or the speaker won't power on.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePure-Fi Anywhere 1st Gen and MM50 fit:\u003c\/strong\u003e\n    These two models use the same 3.7V single-cell pack with identical connector orientation and BMS communication lines. One replacement covers both platforms 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 the Pure-Fi Anywhere platform. The BMS accepted the cell without fault codes, balanced correctly at 4.2V, and cut off cleanly at the low-voltage threshold without triggering false empty readings.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eMonthly full-discharge cycle:\u003c\/strong\u003e\n    These speakers often sit on a desk and get plugged in before the battery drops below 50%. That shallow cycling causes fuel gauge drift over time. Run the speaker down below 20% at least once a month before recharging to keep the charge indicator accurate.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAudio distortion before the battery indicator reaches empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAs the cell voltage sags under amplifier load, the Pure-Fi Anywhere's amp stage clips before the BMS triggers a low-battery warning. The speaker sounds distorted or crackly while the LED still shows charge remaining. This happens because the fuel gauge reads resting voltage, not loaded voltage — the two diverge when the cell ages or has accumulated shallow cycles. If distortion starts appearing consistently at around 30–40% indicated charge, the cell is no longer holding its voltage under load and needs replacement.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSpeaker won't wake from USB after sitting unused for weeks\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLeave a lithium-ion cell discharged long enough and it drops below the USB charging circuit's minimum acceptance voltage — typically around 2.5V for this cell chemistry. When that happens, the charger sees the pack as invalid and won't initiate a charge cycle. If the speaker is completely unresponsive on USB, connect it to a wall adapter rather than a computer port, which delivers a consistent 5V and is more likely to trigger the pre-charge trickle mode. Hold the charge for at least 15 minutes before attempting to power on.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416237113434,"sku":"BWCS-LOPF1RX-1","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416237146202,"sku":"BWCS-LOPF1RX-2","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416237178970,"sku":"BWCS-LOPF1RX-3","price":36.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LOPF1RX-1.webp?v=1779761074","url":"https:\/\/batteryweb.com\/products\/logitech-pure-fi-anywhere-speaker-1st-replacement-battery-37v-3000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}