Orange PH26B Replacement Battery SPV M2000 3.7V 4200mAh

Orange SPV M2000 / M2500 — 3.7V Li-ion Replacement Battery (PH26B)

This is a 3.7V, 4200mAh Li-ion replacement battery for the Orange SPV M2000 and SPV M2500 Windows Mobile smartphones. It replaces OEM part numbers PH26B and AHTXDSSN. If the original cell has degraded and the phone no longer holds a charge, this is the direct swap.

• SPV M2000 and M2500 compatibility: Both devices share the same battery bay dimensions and voltage rail. The connector pinout and BMS handshake are identical across both models, so one cell covers either unit without modification.
• Bench tested on actual hardware: We cycled this cell on the SPV platform and confirmed the BMS communicates charge state correctly to the OS. The protection circuit responded at both the high-voltage cutoff and the low-voltage floor without tripping the device into a false shutdown loop.
• Fuel gauge recalibration on first use: After fitting this cell, run one complete discharge to auto-off and then a full uninterrupted charge before normal use. The SPV's fuel gauge IC was calibrated to the original cell's discharge curve — one full cycle resets its reference point against the new cell.

Sudden shutdown at 20–30% on the SPV M2000 after a cell swap

This happens because the fuel gauge IC still holds the old cell's discharge curve in memory. The new cell has a steeper voltage cliff under modem or screen load than the aged original, so the phone cuts power before the gauge registers critical. The BMS on the replacement cell is not at fault — the problem is the mismatch between the stored discharge model and the actual cell behaviour. One full discharge-to-shutdown followed by a complete charge retrains the coulomb counter and eliminates the premature cutoff.

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

Li-ion cells in long-term storage self-discharge slowly. If the cell drops below approximately 2.5V per cell, the BMS enters lockout to prevent damage and the phone will show no response to the power button. Connect the phone to a wall charger — not a USB port — and leave it for 20–30 minutes before attempting to power on. A wall charger delivers enough current to push the BMS out of lockout, where a low-output USB port may not. If the screen still shows nothing after that period, hold the charge for a further hour before the first boot attempt.