35H00102-00M Vodafone 920 Compatible Battery 3.7V 950mAh

Vodafone 920 — 3.7V Li-ion Replacement Battery (35H00102-00M)

This is a 3.7V, 950mAh Li-ion cell for the Vodafone 920 smartphone. It replaces the original battery when the device no longer holds a useful charge or fails to power on. Dimensions are 44.74 × 36.63 × 5.44mm — verify these against your original cell before installation.

• Vodafone 920 fitment: The 920 uses a compact single-cell Li-ion pack with a low-current BMS matched to the phone's charge IC. This replacement carries OEM part references 35H00102-00M and KII0160, covering the standard battery slot on this model.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the bench and confirmed the BMS communicates correctly with the charge IC — no false full-charge cutoffs and no premature low-battery shutdown during the test sequence.
• Fuel gauge recalibration on first use: After installing this cell, disable fast charging if available and run one full discharge-to-charge cycle before normal use. This lets the fuel gauge IC map its coulomb counter to the new cell's discharge curve — skipping this step is the main reason a new battery shows erratic percentages in the first few days.

Why the Vodafone 920 reports wrong battery percentage after a cell swap

The 920's fuel gauge IC stores a learned discharge curve from the original cell. When you fit a new cell, that stored curve no longer matches the actual voltage-to-capacity relationship of the replacement. The gauge reads voltage, applies the old curve, and outputs an incorrect percentage. One complete discharge down to auto-shutoff followed by a full charge to 100% forces the IC to recalibrate against the new cell — after that cycle, percentage readings stabilise.

Sudden shutdown at 20–30% charge remaining on the replacement cell

This happens when the cell voltage drops sharply under the load of the modem radio or screen backlight — a voltage cliff the fuel gauge doesn't predict from its stored curve. The phone's protection circuit cuts power before the OS can report low battery, so shutdown appears sudden. It is most common in the first few cycles before the fuel gauge recalibrates. Run two full discharge-charge cycles and confirm the cell resting voltage reads above 3.7V after a full charge before concluding there is a fault.