iSpan BTA002 Nokia N95 Replacement Battery 3.7V 900mAh

iSpan DDV-965 — 3.7V Li-ion Replacement Battery (BTA002)

This is a 3.7V, 900mAh Li-ion replacement battery for the Nokia N95 smartphone. It fits the DDV-965 cell slot directly and restores power to devices where the original cell has degraded or failed. Voltage and connector match the OEM specification.

• Nokia N95 cell compatibility: The N95 uses a single-cell 3.7V Li-ion pack with a three-contact connector — positive, negative, and a BSI (Battery Size Indicator) resistor pin. The BTA002 carries the correct BSI resistance value so the phone handshakes without prompting a "battery not supported" warning.
• Bench tested on actual hardware: We ran the BTA002 through charge and discharge cycles on the N95 platform. The BMS held cutoff at the correct low-voltage threshold and the phone accepted a full charge without triggering the overtemperature flag.
• Fuel gauge recalibration on first cycle: After fitting this cell, run one complete discharge to auto-shutdown, then charge uninterrupted to 100%. The N95 fuel gauge IC carries the old cell's discharge curve in memory — skipping this step causes the percentage readout to jump or cut out early until the coulomb counter resets.

Why the Nokia N95 reports wrong battery percentage after a cell swap

The N95 uses a coulomb-counting fuel gauge IC that builds its discharge model from previous charge cycles. When you swap to a new cell, the IC still references the old degraded curve, so the percentage shown on screen no longer matches actual cell voltage. This mismatch causes the display to read 40% while the cell is genuinely near its cutoff voltage. One full uninterrupted discharge-to-charge cycle rewrites the reference curve and brings the readout back in line with the actual cell state.

Sudden shutdown at 20–30% charge shown on screen

This is a voltage cliff failure, not a capacity problem. At 20–30% on a miscalibrated gauge, the cell voltage can already be sitting near 3.5V or lower under the combined load of the N95's modem, display, and processor. That combined draw pulls the cell below the BMS cutoff threshold, triggering an immediate shutdown even though the screen still shows charge remaining. The fix is the same recalibration cycle — one full discharge to auto-shutdown followed by an uninterrupted charge to 100%. After that cycle, the gauge IC maps the actual voltage-to-percentage curve of the new cell, and shutdowns at falsely high percentages stop.