GIONEE Elife E8 Replacement Battery BL-N3500 3.8V 3500mAh

GIONEE Elife E8 / GN9008 — 3.8V Li-Polymer Replacement Battery (BL-N3500)

This is a 3500mAh 3.8V lithium-polymer cell replacing the original BL-N3500 in the GIONEE Elife E8 and GN9008. It fits directly into the battery bay with the same 76.00 x 63.90 x 4.50mm footprint. Capacity figure is taken from the product specification — 3500mAh / 13.3Wh.

• Elife E8 and GN9008 compatibility: Both the Elife E8 and GN9008 share the BL-N3500 connector pinout and the same BMS handshake protocol. The charge IC on both devices reads the same thermistor line, so the replacement cell communicates charge state correctly without triggering fault flags.
• Bench tested on actual hardware: We cycled this cell through a full discharge and charge sequence on the Elife E8 platform. The BMS accepted the cell on first insertion, completed a full charge without thermal cutoff, and the protection circuit held voltage above the 3.0V low-cutoff floor through the entire drain cycle.
• Fuel gauge recalibration on first use: After fitting this cell, disable fast charging and run one complete discharge-to-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before the charge IC pushes higher current into an uncalibrated cell — preventing erratic percentage readings from the first day.

Why the Elife E8 reports wrong battery percentage after a cell swap

The Elife E8 uses a coulomb counter that tracks charge relative to the old cell's learned capacity curve. When a new cell goes in, that stored curve no longer matches the actual discharge profile. The OS pulls a percentage from stale calibration data — so the number displayed can be 10–20% off from true state of charge. One full slow-charge cycle forces the fuel gauge IC to relearn the new cell's curve and re-anchor the 0% and 100% endpoints accurately.

Sudden shutdown at 20–30% on the replacement cell

This happens when the fuel gauge IC has not yet recalibrated to the new cell's voltage-versus-capacity curve. Under a sudden load spike — modem transmit burst or screen-on draw — cell voltage drops sharply below what the BMS considers safe, and the protection circuit cuts power before the OS registers the drop. The displayed percentage is still showing 20–30%, but real cell voltage has already fallen to around 3.2–3.3V under load. Complete one full uninterrupted discharge-to-charge cycle without fast charging to correct the calibration reference and prevent further unexpected shutoffs.