{"product_id":"phicomm-fws610-replacement-battery-37v-1300mah-li-ion","title":"BP-F01 Phicomm FWS610 Compatible Battery 3.7V 1300mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePHICOMM FWS610 \/ FWS810 — 3.7V Li-ion Replacement Battery (BP-F01)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1300mAh Li-ion replacement battery for the PHICOMM FWS610 and FWS810 smartphones. It replaces OEM part BP-F01 when the original cell can no longer hold a charge through daily use. Dimensions are 58.95 × 48.20 × 4.40mm — measure your existing cell before ordering if the back cover shows any swelling.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFWS610 and FWS810 compatibility:\u003c\/strong\u003e\n    Both models share the same battery bay dimensions, connector pinout, and BMS handshake protocol under the BP-F01 spec, so one cell covers either device 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 FWS810 platform. The BMS accepted the cell without a low-voltage lockout event, and the charge IC brought it to 4.2V cutoff cleanly on the first cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After installation, run one full discharge to 10% then charge uninterrupted to 100% before enabling fast charging. This gives the fuel gauge IC a complete reference curve for the new cell — skipping it causes the percentage counter to drift from the first day.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the FWS610 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC on the FWS610 stores a learned discharge curve for the old cell. When a new cell goes in, that stored curve no longer matches the actual voltage-to-capacity relationship of the replacement. The IC reads voltage and maps it to the old curve, so the percentage displayed can be off by 10–20 points. One full uninterrupted discharge-charge cycle forces the IC to rewrite the reference curve against the new cell and typically resolves the drift.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the FWS810 after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the display or modem draws a short burst of current and the cell voltage drops below the BMS cutoff threshold — even though the gauge still shows charge remaining. It is a voltage cliff issue, not a capacity fault. The cell voltage under load dips below 3.2V, the BMS trips, and the phone shuts off. Running that initial full calibration cycle firms up the fuel gauge's low-end voltage mapping, which reduces the gap between displayed percentage and the actual cutoff point.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404212437082,"sku":"BWCS-PMW810SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404212469850,"sku":"BWCS-PMW810SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404212502618,"sku":"BWCS-PMW810SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PMW810SL-1.webp?v=1779369425","url":"https:\/\/batteryweb.com\/products\/phicomm-fws610-replacement-battery-37v-1300mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}