Nokia N96 BL-5F Replacement Battery 3.7V 2000mAh

Nokia N96 — 3.7V Li-ion Replacement Battery (BL-5F)

This is a 3.7V, 2000mAh Li-ion replacement cell for the Nokia N96 smartphone. It slots directly into the N96 battery bay and mates with the original three-contact terminal strip. Capacity is rated at 2000mAh (7.4Wh), matching the OEM BL-5F specification.

• Nokia N96 compatibility: The N96 uses a three-pin battery interface that carries voltage, ground, and a BSI line. The BSI resistor on this cell is set to the value Nokia's battery authentication circuit expects, so the phone's charging IC accepts it without a "battery not supported" flag.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the N96 platform. The BMS held the charge cutoff at 4.20V and the discharge protection tripped cleanly below 3.0V, preventing cell damage on deep run-down.
• Fuel gauge recalibration after install: On first use, disable any background sync and let the phone run from 100% down to automatic shutdown in one uninterrupted discharge, then charge fully to 100% without interruption. This gives the N96's fuel gauge IC one complete reference cycle against the new cell's actual discharge curve before daily use.

Why the N96 reports wrong battery percentage after a cell swap

The N96 uses a coulomb-counting fuel gauge IC that builds its charge model from the previous cell's discharge history. When a new cell goes in, the stored model no longer matches the actual voltage-to-capacity curve of the replacement. The gauge reads a voltage that looks like 60% on the old curve but is actually 80% on the new cell — or vice versa. One full discharge-to-shutdown followed by an uninterrupted charge to 4.20V resets the reference and brings the percentage display back into alignment.

Sudden shutdown at 20–30% on the replacement cell

This happens when the GSM modem fires a high-current burst for a call or data packet and the cell voltage sags below the BMS protection threshold — even though the gauge still shows charge remaining. A freshly installed cell that has not completed its first calibration cycle is most susceptible because the fuel gauge has not yet mapped the new cell's sag characteristics. The phone interprets the voltage drop as a hard cutoff and shuts down. Run the full recalibration cycle described above; after two to three complete cycles, the gauge learns the sag curve and the shutdowns stop. If they persist past three cycles, check that the battery contacts are clean and making firm contact — a high-resistance connection amplifies voltage sag at the same current draw.