Vodafone 255 Li-ion Replacement Battery 3.7V 800mAh

Vodafone 255 / VF255 — 3.7V Li-ion Replacement Battery (Li3710T42P3h553457)

This is a 3.7V, 800mAh Li-ion cell for the Vodafone 255 and VF255 smartphones. It replaces OEM part numbers Li3710T42P3h553457 and li3714T42P3h-653457. Fit this battery when the original no longer holds charge or the phone shuts down unexpectedly under load.

• 255 and VF255 compatibility: Both model numbers reference the same handset platform. They share the same battery bay dimensions, connector pinout, and charge IC voltage rail at 3.7V nominal, so one cell covers both variants.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a 255 unit. The BMS accepted the charge profile without error, and the protection circuit tripped correctly at the low-voltage cutoff threshold — no runaway, no false flags from the charge IC.
• Fuel gauge recalibration on first use: On first installation, disable any fast-charge mode and run one full discharge-to-charge cycle at standard current. The fuel gauge IC on the 255 calibrates its coulomb counter against the new cell's discharge curve. Skip this step and the percentage readout will drift or jump erratically for the first few days.

Sudden shutdown at 20–30% on the Vodafone 255 after a cell swap

A fresh Li-ion cell has a steeper voltage cliff than a worn cell. The 255's modem radio and display draw current spikes that cause the new cell's voltage to dip below the BMS cutoff threshold — even when the fuel gauge still reads 20–30%. This is not a faulty battery. The fuel gauge IC is still mapped to the old cell's discharge curve. Run one complete discharge cycle down to automatic shutdown and then a full charge at standard rate. After that cycle, the coulomb counter re-maps to the new cell and the shutdowns stop.

OS reports wrong battery percentage after fitting the replacement cell

The Vodafone 255 tracks charge state through a fuel gauge IC that was calibrated to the original cell's impedance and capacity curve. When you fit a new 800mAh cell, that calibration is stale. The percentage shown on screen can read 15–20% higher or lower than actual charge state. Discharge the phone fully until it powers off by itself, then charge uninterrupted to 100% without removing the charger. That single full cycle resets the IC's reference points and brings the reported percentage back in line with actual cell state.