{"product_id":"jbl-everest-750-replacement-battery-37v-600mah-li-polymer","title":"JBL Everest 750 Replacement Battery 3.7V 600mAh P663030-01","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eJBL Everest 750 — 3.7V Li-Polymer Replacement Battery (P663030-01)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 600mAh lithium-polymer cell replaces the original P663030-01 battery in the JBL Everest 750 wireless headphones. It restores audio playback and wireless connectivity when the original cell can no longer hold a usable charge. Dimensions are 30.70 × 30.00 × 6.20mm — measure your existing cell before fitting.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEverest 750 platform fit:\u003c\/strong\u003e\n    The Everest 750 runs a single-cell Li-Polymer pack at 3.7V nominal. The P663030-01 footprint is specific to this headphone's internal cavity — the cell dimensions and connector orientation matter here more than most headphone replacements.\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 Everest 750 board. The BMS accepted the new pack without error flags, and charge termination triggered cleanly at 4.2V.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle charging on the Everest 750:\u003c\/strong\u003e\n    Charge the headphones fully via USB before first use. The headphone's fuel gauge circuit calibrates to the new cell's capacity on that first full charge-to-cutoff — skipping it causes the battery indicator to misread 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\"\u003eWhy the Everest 750 cuts out mid-playback on a new battery\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Everest 750 draws simultaneously from the audio amplifier and the Bluetooth radio. Under that combined load, a new cell at storage voltage — typically around 3.6V — can sag enough to trip the BMS undervoltage cutoff. This is not a faulty cell. It happens because the battery shipped at a partial state of charge, not a full one. A complete charge cycle before first use brings the cell to 4.2V and eliminates the sag margin issue on that first session.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery indicator stuck at full after replacement — then drops to zero\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC in the headphones still holds the old cell's discharge profile in memory. The gauge reports incorrectly until it runs one full charge-to-discharge-to-charge cycle with the new cell. Run the headphones down until they shut off automatically, then charge uninterrupted to 100%. After that single calibration cycle, the indicator tracks the actual cell state accurately.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43428113776730,"sku":"BWCS-JBE750SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43428113809498,"sku":"BWCS-JBE750SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43428113842266,"sku":"BWCS-JBE750SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-JBE750SL_1.webp?v=1779934164","url":"https:\/\/batteryweb.com\/products\/jbl-everest-750-replacement-battery-37v-600mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}