Sonim XP Strike BAT-01950-01S Replacement Battery 3.7V 1700mAh

Sonim XP Strike / XP3410 — 3.7V Li-ion Replacement Battery (BAT-01950-01S)

This is a 3.7V, 1700mAh Li-ion replacement battery for the Sonim XP Strike and XP 3410 rugged smartphones. It carries OEM part number BAT-01950-01S and slots directly into the existing battery compartment. If your XP Strike is shutting down early or holding a charge poorly, this cell restores full rated capacity.

• XP Strike / XP3410 fitment: Both the XP Strike and XP 3410 share the same battery bay geometry, connector pinout, and BMS handshake protocol — one cell covers both models without any modification.
• Bench tested on actual hardware: We cycled this battery through charge and discharge on the XP3410 platform. The BMS accepted the cell on first connection, charge termination triggered correctly at 4.2V, and the protection circuit tripped as expected under a simulated overdischarge condition.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one full discharge-to-charge cycle. The XP Strike's fuel gauge IC is calibrated to the old cell's discharge curve — giving it one uninterrupted cycle lets it map the new cell before resuming high-current charging.

Why the XP Strike reports wrong battery percentage after a cell swap

The XP Strike uses a coulomb-counting fuel gauge IC that tracks charge state against a stored discharge curve from the original cell. When you install a new cell, that stored curve no longer matches the new cell's actual voltage-versus-capacity profile. The gauge reads voltage correctly but maps it to the wrong percentage. One complete discharge down to the low-voltage cutoff, followed by a full charge to 4.2V, forces the IC to relearn the curve and restore accurate percentage readings.

Sudden shutdown at 20–30% on the XP Strike after replacement

This happens when the modem radio or display draws a high current burst and the cell voltage drops sharply under that load — faster than the fuel gauge expects. The BMS interprets the voltage dip as a near-empty cell and cuts power to protect the cell. It is most common in the first few cycles before the fuel gauge IC has mapped the new cell's internal resistance. Run two full discharge-charge cycles and check that the resting cell voltage reads above 3.7V before the shutdown point.