GIONEE M6 BL-N5000D Replacement Battery 3.8V 5000mAh

GIONEE M6 / GN8003 — 3.8V Li-Polymer Replacement Battery (BL-N5000D)

This is a 3.8V 5000mAh lithium-polymer replacement battery for the GIONEE M6 and GN8003 smartphones. It replaces OEM part BL-N5000D and fits the original battery bay without modification. Capacity matches the factory spec at 5000mAh (19Wh).

• M6 and GN8003 compatibility: Both the M6 and GN8003 share the same battery bay dimensions, voltage rail, and BMS connector pinout. The BL-N5000D form factor — 91.70 × 64.40 × 4.50 mm — fits either handset without adapter or modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a GIONEE M6 unit. The BMS accepted the handshake on first connection, charge IC registered the cell correctly, and the fuel gauge IC began tracking state-of-charge without manual intervention.
• First-cycle calibration tip: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell.

Why the M6 reports wrong battery percentage after a cell swap

The GIONEE M6 uses a coulomb counter in the fuel gauge IC that builds its reference model from the original cell's discharge curve. When a new cell goes in, that stored model no longer matches the actual cell chemistry and capacity. The OS reads from the fuel gauge — not the cell directly — so it reports percentages calibrated to the old cell. One full discharge from 100% down to automatic shutdown, followed by a full charge with fast charging disabled, forces the IC to rewrite its reference curve against the new cell.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff issue, not a capacity problem. Under heavy load — active LTE modem, bright screen, or simultaneous app activity — the cell voltage drops sharply below what the fuel gauge IC predicted at that state-of-charge. The phone's protection circuit triggers shutdown before the reported percentage hits zero. Run one unconditioned discharge-charge cycle first. If shutdowns persist after calibration, check that cell voltage at shutdown reads above 3.4V using a battery diagnostic app — anything lower points to a BMS trip, not a gauge error.