{"product_id":"blu-advance-40-replacement-battery-37v-1450mah-li-ion","title":"BLU Advance 4.0 Replacement Battery 3.7V 1450mAh C745043160T","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBLU Advance 4.0 \/ A270 — 3.7V Li-ion Replacement Battery (C745043160T)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1450mAh Li-ion battery for the BLU Advance 4.0 (A270, A270A) smartphone. It replaces part number C745043160T when the original cell degrades or fails to hold a usable charge. Dimensions are 74.26 × 50.05 × 4.00mm — confirm these against your existing battery before installing.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eA270 and A270A compatibility:\u003c\/strong\u003e\n    Both variants share the same battery bay dimensions, connector pinout, and 3.7V nominal voltage rail, so one cell covers the full Advance 4.0 lineup without modification.\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 the Advance 4.0 board. The BMS accepted charge current without tripping, and the protection circuit cut off cleanly at the low-voltage threshold rather than allowing deep discharge.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    Disable fast charging for the first complete discharge-charge cycle after installation. This gives the phone's fuel gauge IC time to map the new cell's discharge curve before high-current charging pushes energy into an uncalibrated cell — preventing erratic percentage readings from the start.\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 Advance 4.0 after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Advance 4.0 uses a coulomb-counter-based fuel gauge IC that retains the discharge curve of the old cell in memory. When the replacement cell hits a voltage point the IC associates with a safe operating range, the actual cell voltage under modem or display load can drop below the shutdown threshold faster than the gauge expects. This is a calibration mismatch, not a faulty battery. One full uninterrupted discharge down to auto-shutdown, followed by a full charge, forces the IC to relearn the curve. After one complete cycle, shutdowns at false percentages typically stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone not powering on after the replacement battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells in storage self-discharge slowly. If the cell drops below approximately 2.5V, the battery's BMS protection circuit locks out to prevent damage, and the phone will show no response — no charging indicator, no boot. Connect the phone to a wall charger rather than a USB port on a PC; wall adapters supply consistent 5V and higher current, which is more likely to trigger the trickle-charge recovery mode the BMS needs to re-initialise. Leave it connected for at least 30 minutes before attempting to power on. If the indicator light appears during that window, the BMS has recovered and normal charging will resume.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404279513178,"sku":"BWCS-BLA270SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404279545946,"sku":"BWCS-BLA270SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404279578714,"sku":"BWCS-BLA270SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BLA270SL-1.webp?v=1779369550","url":"https:\/\/batteryweb.com\/products\/blu-advance-40-replacement-battery-37v-1450mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}