{"product_id":"blu-spark-replacement-battery-37v-750mah-li-ion","title":"BLU Spark C49390590T Replacement Battery 3.7V 750mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBLU Spark \/ Spark S130 — 3.7V Li-ion Replacement Battery (C49390590T)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 750mAh Li-ion cell replacement for the BLU Spark and Spark S130 smartphones. It fits directly in place of OEM parts C49390590T and C49390590L. If your original cell has lost capacity or no longer holds a charge, this brings the phone back to working condition without replacing the handset.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSpark and Spark S130 fitment:\u003c\/strong\u003e\n    Both models share the same battery bay geometry, connector pinout, and 3.7V nominal voltage rail. One cell covers both variants 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 BLU Spark unit. The BMS accepted the cell without rejection flags, and the charge IC completed a full cycle without thermal cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after swap:\u003c\/strong\u003e\n    On first use after installation, run one complete discharge down to auto-off, then charge uninterrupted to 100%. This gives the fuel gauge IC one full reference cycle against the new cell's discharge curve before the OS starts reporting percentages you can trust.\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 a replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe BLU Spark's fuel gauge IC holds a charge curve calibrated to the original cell. A new cell has a slightly different internal resistance profile. Under modem or screen load, the phone draws current the gauge didn't predict, voltage sags faster than the IC expects, and the BMS trips a low-voltage cutoff — even though the reported percentage shows charge remaining. One full reference cycle corrects the curve. After that cycle, shutdowns at 20–30% typically stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone won't power 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 this battery shipped or sat unused long enough to drop below approximately 2.5V, the BMS enters a protective lockout and the phone will not respond to the power button. Connect the phone to a wall charger — not a USB port — and leave it for 15–20 minutes without pressing anything. The charge IC will trickle-charge the cell up through the lockout threshold. Once voltage recovers above 3.0V, the BMS re-initialises and the phone will power on normally.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404276072538,"sku":"BWCS-WKM010SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404276105306,"sku":"BWCS-WKM010SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404276138074,"sku":"BWCS-WKM010SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-WKM010SL-1.webp?v=1779369617","url":"https:\/\/batteryweb.com\/products\/blu-spark-replacement-battery-37v-750mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}