Wiko Minimi Replacement Battery 3.7V 750mAh Li-ion

Wiko Minimi — 3.7V Li-ion Replacement Battery (minini)

This is a 3.7V 750mAh (2.78Wh) Li-ion replacement battery for the Wiko Minimi smartphone. It fits directly into the Minimi's battery bay and restores power to the display, processor, and wireless radios. Use it when the original cell can no longer hold a charge or shuts the phone down unexpectedly.

• Wiko Minimi fit: The Minimi runs a single-cell 3.7V Li-ion pack at a fixed form factor — 50.00 x 40.00 x 4.80mm. This cell matches that footprint and voltage rail, so the BMS handshake between battery and charge IC completes without a connector or voltage mismatch.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench. The BMS held cutoff voltage correctly at both ends of the curve, and charge IC communication completed without error flags on our test unit.
• Fuel gauge recalibration on first use: On the first use after installation, run the battery down to automatic shutdown, then charge it in one uninterrupted session to 100%. This gives the Minimi's fuel gauge IC a full reference curve against the new cell — skipping this step is the main cause of erratic percentage readings in the first week.

Sudden shutdown at 20–30% on the Wiko Minimi after a cell swap

The Minimi's processor and modem pull current spikes that a degraded or uncalibrated cell cannot sustain. When cell voltage drops below roughly 3.5V under that load, the BMS trips a protective cutoff before the OS reports zero percent. The phone reads 20–30% remaining because the fuel gauge IC is still tracking an old discharge curve. One full discharge-to-shutdown followed by a complete uninterrupted charge resets that reference — after one cycle, the shutdowns typically stop.

Phone feels warm near the battery during the first few charges

A new cell arrives with slightly higher internal impedance than a broken-in cell. The charge IC pushes current into that higher-resistance cell, and the extra energy dissipates as heat. This is normal during the first two or three charge cycles and drops off as the cell beds in. If the phone stays warm beyond the third charge cycle, check that no background apps are running during charging and that ambient temperature is below 35°C.