About this replacement
Apple iPod Mini 4GB / 6GB — 3.7V Li-ion Replacement Battery (EC003 / EC007)
This 3.7V, 750mAh Li-ion battery replaces the original cell in the Apple iPod Mini 4GB and 6GB. It fits the M9802, M9806FE/A, and over 100 additional iPod Mini variants that share the same internal bay dimensions and connector pinout. Swap it in when the original cell no longer holds a charge through a full listening session.
- iPod Mini 4GB and 6GB platform fit: Both the 4GB and 6GB Mini share the same physical battery bay (39.73 × 31.62 × 5.31mm), the same two-pin ribbon connector, and the same charge IC on the logic board — so one cell works across the whole family.
- Bench tested on actual hardware: We ran this cell on an M9806FE/A unit and confirmed the charge IC accepted the new cell without fault flags, BMS cutoff thresholds matched the original charge curve, and the capacity indicator settled correctly within two full cycles.
- Post-swap trickle charge on the iPod Mini: If the device sat unused for months before the swap, the replacement cell may arrive below the charge IC's wake threshold. Connect the original dock or USB cable immediately after installing and leave it on charge for 30 minutes before attempting to power on — the charge IC needs time to ramp from trickle to full current.
Battery percentage jumping after a cell swap on the iPod Mini
The iPod Mini's charge gauge is voltage-threshold based — it reads cell voltage and maps it to a percentage using fixed reference points stored for the original cell. After swapping to a new cell, the gauge often misreads because the new cell's resting voltage profile differs slightly from a worn original. This causes the indicator to jump — sometimes from 80% to 20% mid-playback, or from 0% to 60% after a short charge. The fix is two full discharge-and-charge cycles, which lets the charge IC re-anchor its thresholds to the new cell's actual voltage curve. After the second cycle, the readout stabilises to within a few percent.
Playback cutting out before the battery indicator shows empty
The audio amplifier in the iPod Mini draws a voltage spike at the end of each decoded audio frame — a brief but sharp load on the cell. In a degraded or deeply discharged cell, this spike causes the voltage to sag below the BMS cutoff threshold, triggering a shutdown even when the gauge still shows remaining charge. A new cell at 3.7V nominal handles the transient draw without sagging. If this cutout persists after the swap, charge the unit to 4.1V before your next session — do not start playback from a partial charge until the cell has completed at least one full cycle.