{"product_id":"samsung-sch-f609-replacement-battery-37v-650mah-li-ion","title":"Samsung SCH-F609 Replacement Battery PPM63M5H 3.7V 650mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSamsung SCH-F609 — 3.7V Li-ion Replacement Battery (PPM63M5H)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 650mAh Li-ion replacement battery for the Samsung SCH-F609 mobile phone. It slots directly into the SCH-F609 battery bay and restores power to calls, messaging, and standard phone functions. Voltage and capacity match the OEM PPM63M5H specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSCH-F609 fit:\u003c\/strong\u003e\n    The SCH-F609 uses a low-capacity single-cell Li-ion pack with a fixed 3.7V nominal rail. This replacement carries the same PPM63M5H form factor and contact pin layout, so the phone's charge IC and protection circuit board recognise the cell 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 a compatible test rig. The BMS held cutoff correctly at both ends of the voltage window — no false full-charge flag and no premature low-voltage trip under simulated call load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first install, disable any fast-charge mode and run one complete discharge-to-charge cycle at standard current. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging begins on an uncalibrated cell.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the SCH-F609 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe SCH-F609's fuel gauge IC builds its percentage estimate from a discharge curve stored in memory — a curve calibrated against the old cell. When a new cell goes in, that stored curve no longer matches actual cell behaviour. The gauge reports inaccurate numbers until it sees a full discharge and charge cycle with the new cell. Run the phone down to auto-shutdown, then charge uninterrupted to 100% and the gauge will re-anchor its reference points. After one full cycle, percentage readings stabilise.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 15–25% on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the cell voltage drops sharply under modem or backlight load — a voltage cliff the fuel gauge did not predict. The phone's protection circuit reads voltage below the safe floor and cuts power before the displayed percentage reaches zero. It is not a faulty battery; it is the gauge misreading state-of-charge on an uncalibrated cell. Charge the phone to 100%, confirm the charger reads a full charge, then repeat the single full-discharge calibration cycle described above.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409449582682,"sku":"BWCS-SMF609SL-1","price":22.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43409449615450,"sku":"BWCS-SMF609SL-2","price":25.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43409449648218,"sku":"BWCS-SMF609SL-3","price":27.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMF609SL-big.webp?v=1779579708","url":"https:\/\/batteryweb.com\/products\/samsung-sch-f609-replacement-battery-37v-650mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}