MeiZu Meilan U10 Compatible Battery BU10 3.85V 2750mAh

MeiZu Meilan U10 / U680 Series — 3.85V Li-Polymer Replacement Battery (BU10)

This is a 3.85V, 2750mAh Li-Polymer replacement cell for the MeiZu Meilan U10, Meilan U10 Dual SIM, U680A, and U680D smartphones. It fits the same physical footprint as the factory BU10 cell at 74.10 × 59.30 × 3.40 mm. Replace it when the original no longer holds a charge or causes unexpected shutdowns under load.

• U10 and U680 variant coverage: The Meilan U10, U10 Dual SIM, U680A, and U680D all share the BU10 connector pinout and the same charge IC voltage rail at 3.85V nominal. One cell fits all four variants without modification.
• Bench tested on actual hardware: We ran this cell through full charge-discharge cycles on the U680 platform. The BMS accepted the cell without tripping protection cutoff, and the charge IC recognised the correct termination voltage at 4.35V.
• Fuel gauge recalibration on first use: 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 into an uncalibrated coulomb counter.

Sudden shutdown at 20–30% on the replacement cell

This happens because the fuel gauge IC still references the discharge curve of the old, degraded cell. The new cell has a steeper voltage cliff at low state-of-charge, so the phone cuts power before the percentage readout catches up. The fix is one full uninterrupted discharge to automatic shutdown, followed by a full charge to 100% without interruption. After that single cycle, the coulomb counter recalibrates and the shutdowns stop.

OS reporting wrong battery percentage after cell swap

The Meilan U10's fuel gauge IC stores learned capacity data from the original cell. Swapping to a new 2750mAh cell does not automatically reset those stored values. The phone may show 100% with voltage still climbing, or drop from 40% to 5% in seconds. Run one full cycle — drain to automatic shutdown, then charge uninterrupted to 100% — and the IC rewrites its baseline against the new cell chemistry.