GIONEE ELIFE S5.1 Replacement Battery BL-N2000B 3.8V 2050mAh

GIONEE Elife S5.1 / GN9005 — 3.8V Li-Polymer Replacement Battery (BL-N2000B)

This is a 3.8V, 2050mAh lithium-polymer cell built to replace the OEM BL-N2000B battery in the GIONEE Elife S5.1 and GN9005 smartphones. It slots into the same battery bay and connects to the same flex-cable connector as the original. Capacity is rated at 7.79Wh.

• Elife S5.1 and GN9005 platform fit: Both models share the same motherboard voltage rail, the same BL-N2000B connector pinout, and the same BMS handshake protocol — one cell covers both devices without modification.
• Bench tested on actual hardware: We cycled this cell through the Elife S5.1 charge IC at 3.8V nominal. The BMS accepted the charge handshake on first connect, held cutoff at 4.35V charge ceiling, and triggered low-voltage protection at 3.0V discharge floor without tripping prematurely.
• Fuel gauge recalibration after swap: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before any high-current session begins.

Why the Elife S5.1 reports wrong battery percentage after a cell swap

The Elife S5.1 uses a fuel gauge IC that stores a learned discharge curve from the old cell. When a new cell goes in, that stored curve no longer matches the real cell chemistry. The gauge reads voltage and estimates percentage against the wrong reference, so the number on screen drifts. One full discharge from 100% to automatic shutdown, followed by a full charge to 100%, forces the IC to rewrite its reference table. After that cycle, percentage readings stabilise.

Sudden shutdown at 20–30% on the replacement cell

This happens when the modem radio or display fires a short high-current draw and the cell voltage dips below the BMS protection floor before the fuel gauge registers the drop. The phone cuts out even though the screen showed charge remaining. It is a calibration gap, not a faulty cell. Run two full discharge-charge cycles without fast charging — by the second cycle the coulomb counter has enough data to predict the voltage sag under load, and the early shutdowns stop. If the fault persists after two cycles, check that the battery flex connector is fully seated — a loose pin raises contact resistance and amplifies the voltage sag.