Nokia XL BN-02 Replacement Battery 3.7V 1650mAh

Nokia XL / XL Dual SIM — 3.7V Li-ion Replacement Battery (BN-02)

This is a 3.7V, 1650mAh (6.11Wh) Li-ion replacement battery for the Nokia XL and XL Dual SIM smartphones. It fits RM-1030 and RM-1042 board revisions and uses the OEM BN-02 form factor. The cell sits in the original battery bay with no modification.

• RM-1030 and RM-1042 compatibility: Both board revisions run the same 3.7V rail and use the same three-contact connector with no BMS handshake variation between single-SIM and Dual SIM models — one cell covers both.
• Bench tested on actual hardware: We cycled this cell on an RM-1042 unit through full charge and discharge passes. The BMS accepted the cell without a protection-circuit lockout, and charge termination triggered correctly at 4.2V.
• Fuel gauge recalibration on first cycle: After installing this cell, run one complete discharge to automatic shutdown followed by a full charge before enabling any fast or turbo charge options — this gives the phone's coulomb counter a clean reference curve against the new cell's discharge profile.

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

The Nokia XL uses a fuel gauge IC that builds its state-of-charge model from the discharge curve of the original cell. A new cell has a slightly different internal resistance and voltage-versus-capacity curve. When the phone draws a burst of current — mobile data handoff or screen-on peak — the new cell's voltage drops briefly below the IC's shutdown threshold even though capacity remains. The IC interprets this as an empty battery and cuts power. One full discharge-to-shutdown cycle followed by a complete charge resets the reference and the shutdowns stop.

Phone won't power on after the replacement battery sat in storage

Li-ion cells in storage self-discharge slowly. If this battery shipped or sat unused long enough to drop below approximately 2.5V per cell, the BMS engages a lockout to prevent damage from an over-discharged state. The phone shows no response — no charging animation, no boot. Connect the phone to a wall charger rated at least 1A and leave it undisturbed for 20–30 minutes without pressing the power button. The charge IC trickle-feeds current into the cell until it clears the BMS lockout threshold, after which normal charging resumes.