{"product_id":"zte-nubia-n1-replacement-battery-385v-4900mah-li-polymer","title":"ZTE Nubia N1 Li3849T44P6h956349 Replacement Battery 3.85V 4900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eZTE Nubia N1 \/ NX541J — 3.85V Li-Polymer Replacement Battery (Li3849T44P6h956349)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 4900mAh Li-Polymer replacement battery for the ZTE Nubia N1 (NX541J) smartphone. It matches the OEM part number Li3849T44P6h956349 and fits the original battery bay without modification. Voltage, connector, and physical dimensions align with factory spec.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNubia N1 \/ NX541J platform fit:\u003c\/strong\u003e\n    Both model designations share the same battery bay dimensions, connector pinout, and BMS handshake protocol — one cell covers both. The NX541J is the hardware model code ZTE used internally; Nubia N1 is the retail name.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through a full charge-discharge cycle on the NX541J board. The BMS accepted the handshake on first connection, charge IC ramped to CC phase without error, and the fuel gauge IC registered cell capacity without a fault flag.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After installation, disable fast charging and run one complete discharge-charge cycle at standard current. The fuel gauge IC on the Nubia N1 calibrates its coulomb counter against the cell's discharge curve — skipping this step on a new, uncalibrated cell can cause the percentage readout to jump or cut off early.\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 Nubia N1 after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA new Li-Polymer cell has a slightly different discharge curve than the worn cell the fuel gauge IC was last calibrated to. At the voltage point where the Nubia N1's modem or display draws a load spike, the cell voltage can sag below the BMS cutoff threshold — even though the reported percentage says 20–30%. The phone reads that as a hard shutoff condition, not a low-battery warning. One full discharge-charge cycle at standard current resets the coulomb counter and maps the new cell's curve correctly. After that cycle, the percentage readout and actual cutoff voltage align.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB fast charge not activating after fitting the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Nubia N1's charge IC performs a handshake check before enabling high-current input — if the BMS on a new cell hasn't completed its first initialisation cycle, the charge IC defaults to trickle or standard 5V charging rather than fast charge mode. This isn't a fault with the charger or the cable. Connect the original ZTE charger and allow one full standard-rate charge cycle to complete. After that cycle, fast charge handshake negotiations resume normally on subsequent charges.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392040468570,"sku":"BWCS-ZTN541SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392040501338,"sku":"BWCS-ZTN541SL-2","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392040534106,"sku":"BWCS-ZTN541SL-3","price":33.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ZTN541SL-1.webp?v=1779143086","url":"https:\/\/batteryweb.com\/products\/zte-nubia-n1-replacement-battery-385v-4900mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}