DM-FV10BP JNC SSF-M2 Replacement Battery 3.7V 1200mAh

JNC Multimedia SSF-M2 / SSF-M20 — 3.7V Li-ion Replacement Battery (DM-FV10BP)

This is a 3.7V, 1200mAh Li-ion replacement battery for the JNC Multimedia SSF-M2 and SSF-M20 portable media players. It matches the original DM-FV10BP specification at 4.44Wh and fits the same physical envelope at 54.91 × 35.56 × 6.13mm. If your player no longer holds a charge or won't power on, this is the direct cell swap.

• SSF-M2 and SSF-M20 compatibility: Both models run the same 3.7V single-cell architecture with an identical connector and BMS handshake. One cell fits both units — no firmware or hardware difference affects compatibility.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the SSF-M2 platform. The BMS accepted charge current without fault codes, and the protection circuit tripped correctly at the low-voltage cutoff threshold.
• Post-swap initialisation on the SSF-M2: After fitting a new cell, connect the charger before attempting to power on. Media players in this class enter a deep-discharge protection state during storage. A slow trickle charge for 20–30 minutes clears the protection state and allows normal charge current to resume.

Battery percentage jumping after cell swap on the SSF-M2

The SSF-M2 uses a voltage-threshold gauge — it reads the cell voltage and maps it to a percentage using fixed lookup points. A new cell with a fresh charge profile won't match the lookup table the device has calibrated to the old, degraded cell. You'll see the percentage jump from 80% to full, or drop suddenly near the end. Run two or three full charge-to-cutoff cycles and the gauge recalibrates. After that the percentage display stabilises at the correct thresholds — roughly 4.2V at full and 3.0V at cutoff.

Playback cutting out before the battery indicator shows empty

The audio amplifier in the SSF-M2 draws a brief current spike during playback that the battery gauge doesn't account for. As the cell reaches the bottom of its discharge curve, voltage sags under that load before the indicator registers low battery. The device cuts out to protect the cell — not because the gauge is wrong, but because the amplifier load hits the BMS low-voltage threshold first. If this happens regularly, charge the device before the indicator drops below 20%.