About this replacement
Cowon M2 Series — 3.7V Li-Polymer Replacement Battery (PR-464465N)
This 3.7V, 1300mAh Li-Polymer battery replaces the original cell in the Cowon M2 portable media player. It fits the M2, M2 16G, and M2 32G variants. Capacity is taken directly from the product specification — 4.81Wh.
- M2, M2 16G, M2 32G compatibility: All three variants share the same battery bay dimensions and connector pinout. The 65.20 × 44.30 × 4.20 mm cell fits the cavity without modification. Voltage rail and BMS handshake requirements are identical across the range.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the M2 platform. The onboard BMS accepted the cell without fault flags, and the protection circuit triggered correctly at the low-voltage cutoff threshold.
- First-charge protocol on the M2: After installing a new cell, charge fully before first use. Media players like the M2 frequently enter deep discharge protection after extended storage. The device may not respond until a slow trickle charge restores enough voltage for the BMS to exit protection mode.
Battery percentage jumping after a cell swap on the M2
The M2 reads battery level by measuring cell voltage against fixed thresholds stored in firmware. A new cell has a different discharge curve than a worn original, so the percentage indicator can jump or drop erratically in the first few cycles. This is not a fault with the replacement cell — it is the firmware recalibrating to the new voltage profile. Run two or three full charge-to-discharge cycles and the readout will stabilise.
Playback cutting out before the battery indicator shows empty
The M2's audio amplifier draws a brief current spike during playback, especially at higher volume levels. Near the end of a discharge cycle, cell voltage sags under that load and drops below the BMS cutoff threshold — even if the indicator still shows charge remaining. The device shuts down to protect the cell. If this happens repeatedly, the cell voltage at shutdown is typically around 3.0V. Allowing a full charge cycle before next use resets the working voltage range.