Vodafone SBP-02 v1210 Compatible Battery 3.7V 1100mAh

Vodafone v1210 / SP 1210 — 3.7V Li-ion Replacement Battery (SBP-02)

This is a 3.7V, 1100mAh Li-ion replacement battery for the Vodafone v1210 and SP 1210 smartphones. It slots in where the original SBP-02 cell sits, restoring power to a handset that no longer holds charge. Capacity matches the OEM spec at 4.07Wh.

• v1210 and SP 1210 compatibility: Both models run the same 3.7V single-cell architecture with an identical battery bay footprint and connector pinout. The BMS on each handset negotiates with the same SBP-02 cell format, so one replacement covers both variants without modification.
• Bench tested on actual hardware: We cycled this cell through charge and load on the v1210 platform. The BMS accepted the cell without fault flags, charge termination triggered correctly at 4.2V, and the protection circuit tripped as expected on over-discharge test at the low-voltage threshold.
• Fuel gauge recalibration on first use: Disable fast charging for the first full discharge-to-charge cycle after fitting this cell. The fuel gauge IC on the v1210 is still calibrated against the old cell's discharge curve. Running one slow cycle lets the IC re-map the new cell before high-current charging pushes current into an uncalibrated state.

Why the v1210 reports wrong battery percentage after a cell swap

The v1210 uses a fuel gauge IC that builds a discharge model over time. When the original cell is removed, that learned model stays in memory — but it no longer matches the new cell's impedance and capacity curve. The phone reads voltage and maps it to a percentage using the old data, so the figure on screen drifts from reality. One full discharge from 100% to auto-off, followed by a full slow charge, forces the IC to rewrite its reference curve against the new cell.

Sudden shutdown at 20–30% on the replacement cell

This happens when the modem or display draws a burst of current and the cell voltage drops sharply under that load. The v1210's BMS interprets the sag as a critically low-voltage event and cuts power before the fuel gauge reads zero. It is not a faulty cell — it is the fuel gauge IC firing the protection circuit on a calibration mismatch. Run the recalibration cycle described above: allow the phone to discharge to auto-off, then charge uninterrupted to 100% on the standard charger. After one complete cycle the cutoff point should stabilise above 3.3V under normal load.