Vodafone Smart 4 Power Replacement Battery TLp030B2 3.8V

Vodafone Smart 4 Power / OT-985N — 3.8V Li-Polymer Replacement Battery (TLp030B2)

This is a 3.8V, 3000mAh Li-Polymer cell replacing part number TLp030B2 in the Vodafone Smart 4 Power and OT-985N smartphones. It matches the original voltage rail, physical footprint (70.55 × 56.30 × 4.88mm), and connector layout. Capacity figure is taken directly from product data at 3000mAh / 11.4Wh.

• Smart 4 Power and OT-985N compatibility: Both handsets share the same battery bay dimensions, 3.8V nominal rail, and TLp030B2 part number. The BMS handshake on both models reads cell impedance on first boot — a fresh cell will register differently than a degraded original, which is expected behaviour.
• Bench tested on actual hardware: We ran the TLp030B2 replacement through charge and discharge cycles on the Smart 4 Power. The BMS accepted the cell without error flags, and the charge IC stepped through trickle, constant-current, and constant-voltage phases cleanly at rated voltage.
• Fuel gauge recalibration after installation: On first use, disable fast charging and run one full discharge down to automatic shutdown, then charge uninterrupted to 100%. This lets the fuel gauge IC map the new cell's discharge curve before the phone begins reporting percentage data — skipping this step causes erratic percentage readings for the first several days.

Why the Smart 4 Power reports the wrong battery percentage after a cell swap

The phone'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 IC reports percentages against the wrong reference. This shows up as the percentage jumping, stalling at a fixed number, or reading 100% while the phone is clearly low. One complete uninterrupted discharge-to-shutdown followed by an uninterrupted charge to 100% resets the coulomb counter and forces the IC to build a new curve against the replacement cell.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff event, not a capacity fault. Under high-current load — modem transmission, screen-on navigation, or simultaneous background sync — the cell voltage drops sharply below the BMS cutoff threshold even though the fuel gauge still shows charge remaining. The gauge and the actual cell voltage disagree because calibration has not completed. Run the full recalibration cycle first; if shutdown persists after that, check that the replacement cell connector is fully seated and that cell voltage reads above 3.6V at rest with a multimeter before reinstalling.