{"product_id":"elephone-ecoo-e04-replacement-battery-37v-2400mah-li-ion","title":"Elephone ECOO E04 Replacement Battery 3.7V 2400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eElephone ECOO E04 — 3.7V Li-ion Replacement Battery (E04)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V Li-ion cell rated at 2400mAh (8.88Wh) for the Elephone ECOO E04 smartphone. It replaces the original internal battery when the existing cell can no longer hold a usable charge or fails to power the device. The E04 OEM part number matches the connector layout and BMS handshake on the ECOO E04 board.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eECOO E04 fit:\u003c\/strong\u003e\n    The ECOO E04 uses a dedicated connector and a board-level fuel gauge IC that reads cell impedance during charge cycles. This cell matches the voltage profile the IC expects, so percentage reporting initialises correctly after a full calibration cycle.\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 ECOO E04 platform. The BMS accepted the cell without error flags, and the charge IC completed a full constant-current to constant-voltage transition at 4.2V without cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration on the ECOO E04:\u003c\/strong\u003e\n    On first use after installation, disable fast charging if available and run one complete discharge-to-charge cycle. This lets the fuel gauge IC build an accurate discharge curve for the new cell before high-current charging pushes current into an uncalibrated state.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC is still calibrated to the old cell's discharge curve. The new cell hits a voltage cliff under screen or modem load — the board reads a valid percentage, then the cell voltage drops below the cutoff threshold instantly. The phone shuts down because actual cell voltage diverges from the IC's prediction. One full discharge cycle from 100% to automatic shutdown, followed by a full charge, resets the coulomb counter and fixes this.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone shows wrong battery percentage after cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe ECOO E04's fuel gauge IC stores charge-state data mapped to the original cell's impedance and capacity fade profile. A fresh cell has lower internal resistance and a different discharge curve, so the IC's stored model is immediately out of sync. This causes percentage jumps, premature low-battery warnings, or a stuck reading at a fixed number. Perform two full discharge and charge cycles without interruption to force the IC to recalibrate against the new cell's actual voltage curve.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392108003418,"sku":"BWCS-EPL004SL-1","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392108036186,"sku":"BWCS-EPL004SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392108068954,"sku":"BWCS-EPL004SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-EPL004SL-1.webp?v=1779143797","url":"https:\/\/batteryweb.com\/products\/elephone-ecoo-e04-replacement-battery-37v-2400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}