BL-N5000 GIONEE V188 Replacement Battery 3.85V 5000mAh

GIONEE V188 / V188S — 3.85V Li-Polymer Replacement Battery (BL-N5000)

This is a 3.85V, 5000mAh Li-Polymer cell replacing the original BL-N5000 battery in the GIONEE V188 and V188S smartphones. The physical dimensions — 86.93 × 59.85 × 6.48 mm — match the factory cell, so the pouch fits the existing battery bay without modification. Connector polarity and pin layout match the OEM spec.

• V188 and V188S compatibility: Both models share the same battery bay dimensions, connector, and charge IC protocol. The BL-N5000 part number covers both variants — the PCB protection circuit and BMS handshake are identical across the two.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a test rig monitoring BMS cutoff thresholds. The protection circuit tripped correctly at the low-voltage floor and the charge IC accepted a standard CC/CV profile without fault flags.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-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 — otherwise the percentage readout will drift.

Sudden shutdown at 20–30% on the V188 after a cell swap

A new Li-Polymer cell has a slightly different internal resistance profile than the aged cell the fuel gauge IC was calibrated against. Under high-draw loads — active call, screen at full brightness, mobile data — the voltage drops sharply at around 3.6–3.65V even though the gauge still reads 20–30% remaining. The phone's low-voltage shutdown circuit fires before the gauge catches up. One full slow-charge cycle lets the coulomb counter recalibrate, after which the reported percentage and actual cell state align more closely.

USB fast charge not activating on the first cycle after replacement

The V188's charge IC negotiates fast-charge current after reading the BMS data on the new cell. On the first cycle, the BMS may report an uncalibrated state that causes the IC to fall back to standard 5V/1A charging as a precaution. This is not a fault — it clears after one complete charge cycle. If fast charging still does not engage after two full cycles, check that the USB cable supports the required current rating, and verify the charger outputs the correct voltage by measuring at the port.