Socketmobile Sonim XP Strike Replacement Battery 3.7V 1700mAh

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

This 3.7V, 1700mAh Li-ion battery replaces the OEM BAT-01950-01S cell in the Sonim XP Strike (XP3410). It fits the full XP Strike range, including models listed as XP 3410 and XP3410. Capacity matches the original spec at 6.29Wh.

• XP Strike and XP3410 fitment: Both model designations share the same chassis, connector pinout, and BMS handshake protocol. One cell fits all variants in this lineup without modification.
• Bench tested on actual hardware: We ran charge and discharge cycles on this cell using the XP Strike charge IC. The BMS accepted charge current normally, balance protection triggered correctly at cell limits, and there were no false overcurrent trips during modem-load simulation.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-charge cycle before enabling it again. This gives the fuel gauge IC time to map the new cell's discharge curve. Without this step, the coulomb counter stays calibrated to the old cell and percentage readings will be inaccurate from the start.

Sudden shutdown at 20–30% on the Sonim XP Strike after a cell swap

This is a voltage-cliff problem, not a capacity defect. When the modem transmits or the screen peaks in brightness, instantaneous current draw spikes hard. A new cell whose fuel gauge IC is still calibrated to the old cell's internal resistance profile can report 25% remaining while the actual cell voltage has already dropped below the shutdown threshold. The phone cuts out before the percentage hits zero. One full recalibration cycle — discharge to automatic cutoff, then a full uninterrupted charge — resets the coulomb counter to the new cell curve and eliminates the premature shutdown.

XP Strike not powering on after the replacement battery sat in storage

Li-ion cells self-discharge in storage. If the battery dropped below roughly 2.5V per cell before installation, the BMS enters lockout mode to prevent damage and will not pass current to the device. The phone shows nothing — no boot screen, no charging indicator. Connect the phone to a wall charger, not a USB port, and leave it undisturbed for 20–30 minutes. The charge IC will trickle current into the cell until voltage rises above the BMS recovery threshold, after which normal charging and boot will resume.