{"product_id":"zte-z18-mini-replacement-battery-385v-3350mah-li-polymer","title":"ZTE Z18 mini Compatible Battery Li3933T44P6h766343 3.85V 3350mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eZTE Nubia Z18 mini — 3.85V Li-Polymer Replacement Battery (Li3933T44P6h766343)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.85V, 3350mAh Li-Polymer cell replaces the original battery in the ZTE Nubia Z18 mini and NX611J. It fits the standard Z18 mini, Nubia Z18 mini Dual SIM, and the TD-LTE variant. Capacity is 12.9Wh — matched to the OEM specification for this chassis.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNX611J and Dual SIM variants:\u003c\/strong\u003e\n    All four fit models share the same battery bay dimensions (74.52 × 61.92 × 4.36mm), the same 3.85V nominal rail, and the same connector pinout. The BMS communicates over the same fuel gauge protocol, so one cell covers the full Z18 mini lineup.\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 on the NX611J platform. The BMS accepted charge from the onboard charge IC without fault flags, and voltage held stable under simultaneous screen-on and LTE modem load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after swap:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one full discharge down to automatic shutdown, then charge to 100% uninterrupted. This gives the fuel gauge IC a clean discharge curve to reference — skipping this step often causes the percentage counter to read inaccurately for the first several cycles.\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 Z18 mini after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff issue, not a capacity defect. A new Li-Polymer cell has a slightly different discharge curve than the aged cell the fuel gauge IC was calibrated against. When the phone hits a load spike — modem handoff, screen wake, GPS fix — the cell voltage drops momentarily below the BMS cutoff threshold even though the coulomb counter still shows charge remaining. The phone shuts down to protect the cell. One full discharge-charge cycle recalibrates the fuel gauge IC and eliminates the mismatch. After that cycle, shutdowns at 20–30% should stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB fast charge not engaging on first cycle after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAfter a cell swap, the Z18 mini's charge IC may default to standard 5V\/1A charging on the first cycle rather than negotiating the higher voltage fast charge protocol. This happens because the BMS on the new cell starts in a conservative state until it completes one recognised charge handshake with the phone's PMIC. Plug in with the original ZTE charger — not a third-party cable — and leave the phone undisturbed through the full first charge. Fast charging typically re-engages automatically from the second charge cycle onward.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392013762650,"sku":"BWCS-ZTZ180SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392013795418,"sku":"BWCS-ZTZ180SL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392013828186,"sku":"BWCS-ZTZ180SL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ZTZ180SL-1.webp?v=1779142920","url":"https:\/\/batteryweb.com\/products\/zte-z18-mini-replacement-battery-385v-3350mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}