{"product_id":"hagenuk-fono-3-replacement-battery-37v-1200mah-li-ion","title":"Hagenuk Fono 3 Replacement Battery BP-MPB16 3.7V 1200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eHagenuk Fono 3 — 3.7V Li-ion Replacement Battery (BP-MPB16)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1200mAh Li-ion cell built to fit the Hagenuk Fono 3 smartphone. It replaces OEM part BP-MPB16 (also cross-referenced as DR6-2009 and DR11-2009). Use it when the original cell no longer holds charge or causes unexpected shutdowns.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFono 3 fitment:\u003c\/strong\u003e\n    The Fono 3 uses a slim removable cell at 53.18 × 34.00 × 6.80mm. This replacement matches those physical dimensions and the 3.7V nominal voltage rail the device's charge IC expects. The connector orientation and BMS communication lines align with the stock configuration.\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 load on the bench. The BMS held cutoff correctly at the low-voltage threshold and accepted a full charge-IC handshake without triggering protection lockout at either end of the voltage range.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first installation, disable fast charging if available and run one complete discharge-to-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before the OS starts drawing on that data for percentage estimates.\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 Fono 3 after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eA fresh Li-ion cell has a steeper voltage cliff than a worn one. The Fono 3's fuel gauge IC was calibrated to the old cell's discharge curve, so it reports 25% remaining while the actual cell voltage is already dropping toward the low-voltage cutoff threshold. Under modem or screen load, current draw accelerates the voltage drop faster than the gauge tracks it. The BMS triggers a hard shutdown to protect the cell before the OS registers a low-battery warning. One full discharge-charge cycle at standard rate resets the coulomb counter and resolves this.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eFono 3 showing erratic battery percentage after replacement\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003ePercentage jumping — say, from 60% to 45% in seconds, or stalling at a fixed number for an extended period — points to a fuel gauge IC that has not yet mapped the new cell. The IC holds state data from the previous cell in non-volatile memory. It applies that old curve to a cell with different internal resistance and capacity characteristics, producing inaccurate readouts. Drain the battery until the phone powers off on its own, then charge uninterrupted to 100% without removing the cable. That single full cycle forces the IC to rewrite its reference curve to the new cell.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405044711514,"sku":"BWCS-DEP330SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405044744282,"sku":"BWCS-DEP330SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405044777050,"sku":"BWCS-DEP330SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-DEP330SL-1.webp?v=1779369842","url":"https:\/\/batteryweb.com\/products\/hagenuk-fono-3-replacement-battery-37v-1200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}