{"product_id":"bea-fon-sl560-replacement-battery-37v-650mah-li-ion","title":"Bea-fon SL560 Replacement Battery 3.7V 650mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBea-fon SL560 \/ SL450 — 3.7V Li-ion Replacement Battery (SL560\/SL450)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 650mAh Li-ion cell replaces the original battery in the Bea-fon SL560 and SL450 mobile phones. Both handsets share the same battery bay geometry and connector, making a single cell compatible across both models. Capacity is 650mAh (2.41Wh), matching OEM specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSL560 and SL450 shared platform:\u003c\/strong\u003e\n    Bea-fon built the SL560 and SL450 on a common hardware platform — same voltage rail at 3.7V, same physical connector orientation, and the same BMS handshake protocol. One cell covers both.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell on the SL560 through charge and discharge under screen-on and call-active loads. The BMS held cutoff correctly at both ends of the charge window with no false low-battery trips.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after installation:\u003c\/strong\u003e\n    On first use after fitting this cell, disable any fast-charge mode and run one full discharge-charge cycle before normal use. This lets the fuel gauge IC map the new cell's actual discharge curve 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 SL560 after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe SL560 uses a coulomb-counter fuel gauge that was calibrated against the original cell's internal resistance and discharge curve. A new cell has lower impedance, so the gauge underestimates remaining capacity and triggers a low-voltage cutoff too early — usually at the 20–30% mark. The phone isn't actually out of charge; the gauge is reading the wrong voltage cliff. One full discharge down to auto-off, followed by an uninterrupted charge to 100%, resets the counter and brings percentage reporting back into line.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone won't power on after sitting in storage with a flat battery\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the SL560 or SL450 has been stored discharged for weeks, the cell can drop below 2.5V — the threshold where the BMS locks out to prevent damage. The phone will show nothing when you press the power button, and may not respond to a charger on the first attempt. Plug in a charger and leave it connected for 20–30 minutes without attempting to power on; most BMS circuits on these cells will accept a trickle recovery current and release the lockout once the cell climbs back above 2.9V. If the phone then shows a charge indicator, let it reach full charge before powering on.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392101417050,"sku":"BWCS-BES560SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392101449818,"sku":"BWCS-BES560SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392101482586,"sku":"BWCS-BES560SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BES560SL-1.webp?v=1779143796","url":"https:\/\/batteryweb.com\/products\/bea-fon-sl560-replacement-battery-37v-650mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}