{"product_id":"blu-star-45-replacement-battery-37v-1550mah-li-ion","title":"BLU Star 4.5 Replacement Battery 3.7V 1550mAh C635404170L","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBLU Star 4.5 \/ S450 — 3.7V Li-ion Replacement Battery (C635404170L)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1550mAh Li-ion cell that fits the BLU Star 4.5 and S450 smartphones. It replaces OEM part C635404170L and restores power to a phone that no longer holds charge or shuts down unexpectedly. Capacity is 5.74Wh — matched to the original spec.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eStar 4.5 and S450 compatibility:\u003c\/strong\u003e\n    Both models share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The cell measures 63.05 × 54.05 × 4.60mm — a match to the factory cavity on both variants.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on a BLU S450 unit. The BMS accepted the charge IC handshake without faults, and the fuel gauge IC tracked state-of-charge correctly after one full conditioning cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first install:\u003c\/strong\u003e\n    After fitting this cell, disable fast charging and run one complete discharge down to auto-shutoff, then charge uninterrupted to 100%. This lets the fuel gauge IC map its reference curve to the new cell before high-current charging begins.\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 BLU Star 4.5\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC is still calibrated to the old cell's discharge curve. The replacement cell hits a voltage cliff under modem or display load before the OS percentage reading reaches zero. The phone interprets the voltage drop as a hard fault and cuts power. One full discharge-to-shutoff cycle followed by an uninterrupted charge to 100% forces the coulomb counter to reset its reference points against the new cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eOS reporting wrong battery percentage after cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC stores a learned discharge profile from the old cell. A new cell with different internal resistance throws that profile off immediately. You'll see the percentage jump erratically or read higher than actual. Run one full cycle — discharge to auto-shutoff, charge to 100% with the screen off — and the coulomb counter recalibrates. After that cycle, percentage reporting stabilises.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404146147418,"sku":"BWCS-BLS450SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404146180186,"sku":"BWCS-BLS450SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404146212954,"sku":"BWCS-BLS450SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BLS450SL-1.webp?v=1779369080","url":"https:\/\/batteryweb.com\/products\/blu-star-45-replacement-battery-37v-1550mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}