DM-Tech DM-AV10 Compatible Battery 3.7V 1200mAh Li-ion

DM-Tech DM-AV10 — 3.7V Li-ion Replacement Battery

This 3.7V 1200mAh Li-ion battery replaces the original cell in the DM-Tech DM-AV10 portable media player. It fits the DM-AV10 directly and restores the device's ability to run on battery power. Capacity is 1200mAh (4.44Wh) — matching the original cell specification.

• DM-AV10 fit: The DM-AV10 runs a single-cell 3.7V Li-ion configuration with a compact form factor. This cell measures 54.91 × 35.56 × 6.13mm and matches the original connector and physical footprint for a direct swap without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a media player test rig. The protection circuit managed over-charge cutoff at 4.2V and triggered low-voltage cutoff before cell damage could occur — consistent with standard single-cell Li-ion BMS behaviour.
• Post-install charge cycle: After fitting a new cell, charge the DM-AV10 fully before first use. Media players frequently enter a deep discharge protection state during storage, and the device may not respond to the power button until a slow trickle charge raises the cell voltage above the BMS re-entry threshold.

Battery percentage jumping after a cell swap on the DM-AV10

The DM-AV10 uses a voltage-threshold method to estimate charge level — it reads cell voltage and maps it to a percentage. After a cell swap, the new cell's resting voltage does not match the internal lookup table the firmware built around the old, degraded cell. This causes the indicator to jump between values until the firmware recalibrates. Run two full charge-to-discharge cycles and the percentage display will stabilise as the firmware resets its reference points.

Playback cutting out before the battery indicator shows empty

The audio amplifier in the DM-AV10 draws a spike of current during playback — more than the display or processor alone. Near the end of a discharge cycle, cell voltage sags under that load even when the resting voltage still reads above the cutoff threshold. The BMS sees the sag as a low-voltage event and shuts down output to protect the cell, which the device reads as a sudden power loss rather than an empty battery. If this happens repeatedly on a new cell, check that the connector is fully seated — poor contact increases internal resistance and makes the sag worse.