Orange SPV M3000 Replacement Battery WIZA16 3.7V 2800mAh

Orange SPV M3000 — 3.7V Li-ion Replacement Battery (WIZA16)

This is a 3.7V, 2800mAh Li-ion cell built to fit the Orange SPV M3000 Windows Mobile smartphone. It replaces the original WIZA16 battery when the existing cell no longer holds adequate charge for daily use. Physical dimensions are 51.86 × 38.97 × 12.48mm — confirm these against your existing battery before fitting.

• SPV M3000 fitment: The M3000 uses a single-cell 3.7V pack with a proprietary connector pinout that carries both charge control and fuel gauge data lines. This replacement matches that pinout so the phone's charge IC and gas gauge IC can communicate with the new cell correctly.
• Bench tested on actual hardware: We cycled this cell through charge and discharge under load conditions that reflect the M3000's combined radio, screen, and PDA workload. The BMS held cutoff voltage cleanly and did not trip under the draw spikes the GSM modem produces.
• Fuel gauge recalibration on first cycle: On first use after fitting, run the battery down to automatic shutdown and then charge uninterrupted to 100% before resuming normal use. This gives the coulomb counter a full reference cycle against the new cell's discharge curve before the phone starts making state-of-charge calculations.

Why the SPV M3000 reports wrong battery percentage after a cell swap

The M3000's fuel gauge IC stores a learned discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches actual cell behaviour, so the percentage reading drifts from the real state of charge. The gauge recalibrates by observing a complete discharge-to-shutdown followed by a full uninterrupted charge. Until that cycle completes, expect the percentage display to read high or low by a noticeable margin.

Sudden shutdown at 20–30% remaining on the replacement cell

This happens when the cell voltage drops below the load threshold faster than the fuel gauge predicts — particularly when the GSM radio transmits or the backlight draws peak current. The BMS sees voltage fall under 3.0V and cuts output before the displayed percentage reaches zero. It is not a fault with the replacement cell; it means the fuel gauge IC has not yet mapped the new cell's voltage-under-load curve. One full discharge-charge calibration cycle typically moves the shutdown point back to below 5%.