{"product_id":"zte-nubia-z11-max-replacement-battery-38v-4000mah-li-polymer","title":"ZTE Nubia Z11 Max Li3839T43P6h406790 Compatible Battery 3.8V 4000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eZTE Nubia Z11 Max — 3.8V Li-Polymer Replacement Battery (Li3839T43P6h406790)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.8V, 4000mAh Li-Polymer cell replaces the original battery in the ZTE Nubia Z11 Max (NX523, NX523J). It matches OEM part number Li3839T43P6h406790 and fits the physical footprint at 88.50 × 66.90 × 3.70 mm. Capacity is 15.2Wh, identical to the factory specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNX523 and NX523J compatibility:\u003c\/strong\u003e\n    Both variants share the same battery bay dimensions, connector pinout, and BMS handshake protocol. One cell covers both board revisions 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 full charge and discharge on the NX523 board. The BMS accepted the cell without fault flags, and the charge IC held the correct 4.35V cutoff throughout.\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 begins on an uncalibrated cell.\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 Z11 Max after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Z11 Max uses a coulomb counter that was calibrated against the original cell's discharge curve. A new cell has a slightly different voltage-to-capacity slope, so the reported percentage drifts from actual state of charge. Under modem transmission or screen brightness peaks, the real cell voltage can drop below the minimum threshold while the OS still reads 25%. One full discharge to automatic shutdown followed by an uninterrupted charge to 100% forces the fuel gauge IC to reset its end-point registers against the new cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eOS reporting erratic or frozen battery percentage after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen the old cell is removed, the coulomb counter loses its learned capacity reference. Until one complete cycle runs, the IC interpolates from stale register values, causing percentage jumps or a reading that barely moves for long stretches. This is a software calibration state, not a cell defect. Drain the phone until it shuts off automatically, then charge in one session to 100% without interruption — after that cycle the percentage tracking stabilises.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392086835290,"sku":"BWCS-ZTN523XL-1","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392086868058,"sku":"BWCS-ZTN523XL-2","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392086900826,"sku":"BWCS-ZTN523XL-3","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ZTN523XL-1.webp?v=1779143708","url":"https:\/\/batteryweb.com\/products\/zte-nubia-z11-max-replacement-battery-38v-4000mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}