{"product_id":"nokia-lumia-550-replacement-battery-38v-2200mah-li-ion","title":"BL-T5A Nokia Lumia 550 Compatible Battery 3.8V 2200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNokia Lumia 550 \/ 730 \/ 735 Series — 3.8V Li-ion Replacement Battery (BL-T5A)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.8V, 2200mAh Li-ion cell replacing the OEM BL-T5A \/ BV-T5A battery. It fits the Nokia Lumia 550, Lumia 730, Lumia 735, and Lumia 735 Dual SIM, along with six additional compatible models. The cell restores power to the processor, display, modem, and all onboard communications hardware.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eLumia 550 \/ 730 \/ 735 platform fit:\u003c\/strong\u003e\n    These models share the same BL-T5A form factor, 3.8V nominal rail, and contact pinout. One cell covers the full range because the BMS handshake and physical connector are identical across the platform.\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 Lumia 730. The BMS accepted the charge IC handshake cleanly, hit full cutoff at 4.35V, and held the low-voltage threshold at 3.0V without false trips.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's 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\"\u003eWhy the Lumia 550 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Lumia 550 uses a coulomb counter and a stored discharge curve to estimate remaining charge. When you fit a new cell, that stored curve still reflects the old, degraded battery. The fuel gauge IC reads state-of-charge against the wrong baseline, so the percentage shown on screen is inaccurate from the first boot. Run one full discharge to below 10%, then charge uninterrupted to 100% — this forces the IC to rewrite the reference curve against the new cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% remaining on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the modem or display fires a high-current draw and the cell voltage drops sharply below the BMS cutoff threshold — even though the gauge still shows charge remaining. It is a voltage cliff, not a capacity fault. The fuel gauge IC has not yet correlated the new cell's internal resistance profile to its voltage curve. After one full calibration cycle, the gauge tracks the voltage sag correctly and the phantom shutdowns stop.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392078708826,"sku":"BWCS-NK550XL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392078741594,"sku":"BWCS-NK550XL-2","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392078774362,"sku":"BWCS-NK550XL-3","price":33.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NK550XL-1.webp?v=1779143638","url":"https:\/\/batteryweb.com\/products\/nokia-lumia-550-replacement-battery-38v-2200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}