{"product_id":"bea-fon-sl645-replacement-battery-37v-1300mah-li-ion","title":"Bea-fon SL645 Replacement Battery 3.7V 1300mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBea-fon SL645 \/ SL645 Plus — 3.7V Li-ion Replacement Battery (ICP5\/44\/55)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1300mAh (4.81Wh) Li-ion cell for the Bea-fon SL645 and SL645 Plus mobile phones. It replaces part number ICP5\/44\/55 and fits both model variants. Install it when the original cell no longer holds a charge or the phone shuts down unexpectedly under load.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSL645 and SL645 Plus compatibility:\u003c\/strong\u003e\n    Both models share the same battery bay dimensions, connector pinout, and BMS communication protocol. One cell covers both variants — no modification needed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through a full discharge-charge sequence on the SL645 platform. The BMS accepted the cell without fault codes, and the charge IC reached termination voltage cleanly at 4.2V.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle fuel gauge reset:\u003c\/strong\u003e\n    After installation, disable any fast-charge mode and run one complete discharge down to auto-shutoff, then charge uninterrupted to 100%. This gives the fuel gauge IC a clean reference curve against the new cell before high-current charging sessions begin.\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 SL645 after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe SL645's fuel gauge IC stores a discharge curve calibrated to the original cell. A new cell with a slightly different internal resistance profile causes the IC to misread remaining capacity. When the phone places a load spike — screen on, call active, radio polling — the actual cell voltage drops below the cutoff threshold before the reported percentage reaches zero. The phone shuts down even though the display showed charge remaining. One full uninterrupted discharge-to-shutoff cycle followed by a full charge resets the coulomb counter and corrects this behaviour.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone not powering on after the replacement cell sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge during storage. If the cell voltage has dropped below approximately 2.5V, the BMS enters a lockout state and blocks current flow to protect the cell from damage. The phone will not respond to the power button or show any charging indicator initially. Connect to a charger and leave it for 15–20 minutes without pressing anything — the charge IC will trickle current into the cell until voltage rises above the BMS re-enable threshold, after which normal charging resumes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391805096026,"sku":"BWCS-BES645SL-1","price":35.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391805128794,"sku":"BWCS-BES645SL-2","price":41.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391805161562,"sku":"BWCS-BES645SL-3","price":45.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BES645SL-1.webp?v=1779142221","url":"https:\/\/batteryweb.com\/products\/bea-fon-sl645-replacement-battery-37v-1300mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}