Huawei Mate 10 Lite Replacement Battery HB436486ECW 3.85V 3900mAh

Huawei Mate 10 Lite / Nova 2i — 3.85V Li-Polymer Replacement Battery (HB436486ECW)

This is a 3.85V, 3900mAh (15.02Wh) Li-Polymer battery for the Huawei Mate 10 Lite, Nova 2i, Honor 9i, and G10 Plus, among others. It uses OEM part number HB436486ECW and drops into the same battery bay with the original flex connector. Capacity matches the factory cell — 3900mAh from the product specification.

• Mate 10 Lite / Nova 2i platform compatibility: These models share the same Kirin 659 platform, battery bay dimensions, and BMS handshake protocol. The HB436486ECW connector pinout and NTC thermistor line are identical across all listed variants, so the charge IC communicates with the replacement cell the same way it did with the original.
• Bench tested on actual hardware: We cycled this cell through charge, load, and cutoff on a Mate 10 Lite unit. The BMS accepted the cell without fault codes, fast charge negotiation completed on the second cycle, and low-voltage cutoff triggered correctly at the expected floor voltage.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. The fuel gauge IC needs to map the new cell's discharge curve before it can report percentage accurately — skipping this step causes erratic percentage readings or early cutoff warnings.

Sudden shutdown at 20–30% on the Mate 10 Lite after a cell swap

This happens because the fuel gauge IC is still referencing the discharge curve of the old, degraded cell. When the Kirin 659's modem or the screen fires a current spike, the new cell's actual terminal voltage drops faster than the gauge predicts, and the protection circuit cuts power before the displayed percentage reaches zero. It is not a defective cell — it is a calibration gap. Run one full discharge to automatic shutdown, then charge uninterrupted to 100% at standard rate. After that single cycle, the coulomb counter recalibrates and shutdowns at 20–30% stop.

USB fast charge not negotiating after battery replacement

Huawei's proprietary FCP fast charge protocol requires the charge IC to confirm cell temperature and impedance within a narrow window before it steps voltage up. A brand-new cell has higher internal impedance than a broken-in cell, so the charge IC falls back to standard 5V charging on the first cycle as a protective measure. This is expected behaviour, not a fault. Charge once at standard rate to full capacity — impedance drops as the cell completes its first cycle, and FCP negotiation succeeds from the second charge onward. Confirm fast charge is active by checking the lock screen for the Huawei fast charge indicator.