HBU83S Vodafone VF716 Replacement Battery 3.7V 950mAh

Vodafone VF716 / VF736 — 3.7V Li-ion Replacement Battery (HBU83S)

This is a 3.7V Li-ion cell rated at 950mAh (3.52Wh), built to fit the Vodafone VF716, VF736, and 715 series smartphones. It replaces OEM part numbers HBU83S and HB4A1H. Swap it in when the original cell no longer holds a usable charge through a normal day.

• VF716 and VF736 compatibility: Both models share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The cell measures 53.78 × 34.05 × 4.80mm — a spec match across this Vodafone sub-series.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the VF716 platform. The BMS accepted the cell without fault flags, and the charge IC stepped through trickle, constant-current, and constant-voltage phases cleanly.
• Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging and run one full discharge-to-charge cycle. The fuel gauge IC on the VF716 is calibrated to the old cell's discharge curve. One unconstrained cycle lets it remap against the new cell before high-current charging begins.

Why the VF716 reports wrong battery percentage after a cell swap

The VF716 uses a coulomb counter in its fuel gauge IC to track charge state. That counter was trained on the original cell's internal resistance and discharge curve. A new cell has different impedance characteristics, so the IC's model no longer matches real charge state. The phone may show 80% when the cell is closer to 60%, or jump from 40% to 15% under load. One full discharge to auto-shutdown followed by a complete charge to 100% forces the IC to rebuild its calibration table against the new cell.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff failure, not a capacity problem. When the modem transmits or the screen backlight peaks, current draw spikes and the cell's terminal voltage drops sharply. If the fuel gauge IC still thinks there is charge remaining but the cell voltage sags below the BMS cutoff threshold — typically around 3.0V — the BMS trips and the phone shuts off. The fix is the same recalibration cycle: discharge fully, charge to 100% uninterrupted, and let the fuel gauge IC anchor its low-voltage threshold to the new cell's actual knee voltage.