About this replacement
Vodafone Mini D100 / D101 — 3.7V Li-ion Replacement Battery (BYD070210145373)
This is a 3.7V 800mAh Li-ion cell for the Vodafone Mini D100 and Mini D101 compact smartphones. It matches the OEM part number BYD070210145373 and fits the same battery bay without modification. Dimensions are 51.80 × 30.10 × 5.70mm — confirm against your existing cell before installing.
- D100 and D101 platform fit: Both models share the same battery bay dimensions, connector pinout, and BMS handshake protocol, which is why a single cell covers the full range. Voltage rail and cell footprint are identical across Mini D100 and Mini D101 hardware revisions.
- Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on the D100 platform. The BMS accepted the cell without triggering a protection cutoff, and the charge IC completed a full constant-current to constant-voltage transition at 4.2V.
- Fuel gauge recalibration after install: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes into an uncalibrated state — otherwise the OS percentage readout will drift.
Sudden shutdown at 20–30% on the Mini D100 after a cell swap
This is a voltage cliff issue, not a capacity problem. Under modem-active or display-on load, the new cell's terminal voltage drops sharply below the threshold the fuel gauge IC expects at that reported state-of-charge. The phone's low-voltage protection trips before the displayed percentage reaches zero. One full discharge-charge cycle lets the coulomb counter re-anchor its end-point voltage model to the new cell, and the premature shutdowns stop.
Phone warm near the battery compartment during the first charge
A fresh replacement cell typically arrives with elevated internal impedance compared to a broken-in cell. During the first constant-current charge phase, the charge IC dissipates more energy across that impedance as heat. This is normal and reduces after one or two full cycles as impedance settles. If the device stays warm past the second full charge, check that the charge IC is not stuck in a high-current mode — confirmed by reading the charge current via a USB meter; it should taper below 100mA as the cell approaches 4.2V.