Swisscom XPA v1510 Compatible Battery 3.7V 1250mAh

Swisscom XPA v1510 — 3.7V Li-Polymer Replacement Battery (35H00077-00M)

This is a 3.7V, 1250mAh lithium-polymer cell for the Swisscom XPA v1510 smartphone. It replaces OEM part numbers 35H00077-00M, 35H00077-02M, and TRIN160. If your original battery no longer holds a usable charge or the phone shuts down unexpectedly, this cell is the direct swap.

• XPA v1510 compatibility: The v1510 runs a single-cell 3.7V nominal rail with a BMS that checks cell impedance on connection. This 1250mAh Li-Polymer cell matches that voltage rail and connector pinout, so the BMS handshake completes without error codes or forced shutdowns.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench and confirmed the BMS accepted the cell without triggering protection cutoff. Charge termination occurred correctly at 4.2V, and the cell discharged to the 3.0V cutoff floor without mid-cycle dropout.
• Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging and run one full discharge-charge cycle at standard rate. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before fast charge current is applied to an uncalibrated cell.

Why the XPA v1510 reports wrong battery percentage after a cell swap

The XPA v1510 uses a fuel gauge IC that builds its charge model around the discharge curve of the cell it was calibrated against. When you install a new cell, the IC's stored curve no longer matches the actual cell chemistry, so the percentage reading drifts. This shows up as the phone reporting 40% and then cutting off, or jumping from 60% to 15% without warning. One full discharge down to automatic shutdown, followed by an uninterrupted charge to 100%, resets the coulomb counter and aligns the gauge to the new cell. After that cycle, percentage readings stabilise.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage collapses under a high-current load — typically the modem during a call or the screen at full brightness — before the fuel gauge reads zero. A new cell with slightly higher internal impedance than the original will sag faster under that load, hitting the BMS undervoltage cutoff at 3.0V while the gauge still shows charge remaining. The fix is to complete two or three full discharge-charge cycles so the cell's impedance settles and the fuel gauge recalibrates its low-voltage threshold mapping. If shutdowns continue past the third cycle, check that the battery connector is fully seated — a partial connection raises contact resistance and worsens voltage sag at the same current draw.