Vodafone Mini D100 Replacement Battery 3.7V 750mAh

Vodafone Mini D100 / Mini D101 — 3.7V Li-ion Replacement Battery

This is a 3.7V, 750mAh (2.78Wh) lithium-ion cell for the Vodafone Mini D100 and Mini D101. It replaces the original battery when the phone no longer holds charge or shuts down unexpectedly. The cell matches the original's dimensions at 46.20 × 34.14 × 5.68mm and uses the same connector as the factory unit.

• Mini D100 and D101 compatibility: Both models run the same voltage rail and share an identical battery bay and connector pinout, so one cell covers both variants without modification.
• Bench tested on actual hardware: We cycled the cell through charge and discharge on the D100 platform and confirmed the BMS handshake completes correctly — charge IC accepted the cell and protection circuits tripped at expected thresholds.
• First cycle after installation: On first use, disable fast charging if the option is available and run one full discharge-charge cycle. This lets the fuel gauge IC recalibrate its discharge curve against the new cell before high-current charging begins pushing current into an uncalibrated state.

Why the Mini D100 reports the wrong battery percentage after a cell swap

The D100's fuel gauge IC builds its charge model from the previous cell's discharge curve. When a new cell goes in, that stored model no longer matches the actual chemistry. The gauge reads against an old reference and reports inaccurate figures — sometimes showing full charge when the cell is not, or triggering low-battery warnings too early. One complete discharge to automatic power-off followed by a full uninterrupted charge resets the coulomb counter and brings percentage reporting back into line.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff issue, not a capacity issue. Under modem transmission or screen load, the cell's internal resistance causes a short voltage drop that the BMS reads as a safe-cutoff threshold — even if the reported percentage looks healthy. It happens most often in the first few cycles before the cell is broken in. Run two or three full charge cycles without interruption and the internal resistance stabilises, which raises the voltage floor under load and stops the unexpected cutoff.