{"product_id":"doogee-f5-replacement-battery-38v-2400mah-li-polymer","title":"Doogee F5 Replacement Battery 3.8V 2400mAh Li-Polymer","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eDoogee F5 — 3.8V Li-Polymer Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.8V 2400mAh Li-Polymer cell replaces the original battery in the Doogee F5 Android smartphone. It matches the factory voltage, physical dimensions (83.96 × 58.75 × 3.50mm), and connector orientation of the stock cell. Capacity is rated at 9.12Wh — identical to the original specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDoogee F5 fitment:\u003c\/strong\u003e\n    The F5 uses a fixed battery bay with a ZIF-style flex connector. This cell matches that bay geometry and connector pinout exactly — no trimming or adapter required.\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 F5 platform. The onboard charge IC accepted the cell without fault flags, and the BMS held steady through screen-on and modem-active load states.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before the charge IC applies higher current on subsequent cycles.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the F5 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe F5 uses a coulomb counter that builds its capacity model against the old cell's discharge curve. When you install a new cell, that stored model no longer matches the actual chemistry in the bay. The phone's fuel gauge IC reads voltage and interpolates percentage from a curve calibrated to the degraded original — so it can read 40% on a cell that is actually at 60%. One full discharge to automatic shutdown followed by a full uninterrupted charge resets the coulomb counter and re-anchors the curve to the new cell.\u003c\/p\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 cell voltage drops below the BMS cutoff threshold under high instantaneous load — typically the LTE modem or display backlight pulling current during what the gauge still shows as a mid-range state of charge. The cell voltage collapses faster than the gauge updates, and the BMS trips the output before the display percentage catches up. After the recalibration cycle described above, the fuel gauge tracks actual cell voltage more accurately and the shutdowns stop. If they persist past two full cycles, check that the connector is fully seated — a high-resistance contact at the flex connector produces the same voltage sag symptom under load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392049872986,"sku":"BWCS-DGF500SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392049905754,"sku":"BWCS-DGF500SL-2","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392049938522,"sku":"BWCS-DGF500SL-3","price":33.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-DGF500SL-1.webp?v=1779143470","url":"https:\/\/batteryweb.com\/products\/doogee-f5-replacement-battery-38v-2400mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}