Creative V Media Player Replacement Battery 3.7V 650mAh

Creative Zen V / DAP-FL0040 — 3.7V Li-Polymer Replacement Battery (BA20603R79919)

This is a 3.7V 650mAh lithium-polymer replacement battery for the Creative V, V Plus, DAP-FL0040, and Zen V portable media players. It matches the original BA20603R79919 cell in voltage, chemistry, and form factor. At 41.39 × 29.69 × 5.14mm, it fits the original battery bay without modification.

• V, V Plus, DAP-FL0040, and Zen V compatibility: These four models share the same PCB layout, battery bay dimensions, and connector pinout. The BMS on each accepts the same 3.7V Li-Polymer cell with no firmware or handshake difference between variants.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Zen V platform. The BMS engaged cutoff cleanly at both the high and low voltage thresholds, and charge acceptance was normal across all test units — no balancing errors or rejected charge events.
• Post-swap charge cycle on media players: After fitting a new cell, charge the player fully before first use. Units that have sat discharged for weeks or months often enter deep discharge protection, which requires a slow trickle current before the device accepts a normal charge rate. Connect the charger and leave it for at least 30 minutes before attempting to power on.

Battery percentage jumping after cell swap on the Zen V

After replacing the battery, the on-screen percentage indicator may jump erratically — showing 80%, then dropping to 40%, then climbing again within minutes. This happens because the player's fuel gauge relies on stored voltage-threshold calibration data tied to the old cell's discharge curve. The new cell has a slightly different resting voltage at each state of charge, so the indicator recalibrates over the first few full cycles. Run two or three full charge-to-discharge cycles and the readings will stabilise.

Playback cutting out before the battery indicator shows empty

The audio amplifier on the V and Zen V draws a brief current spike when driving output at higher volumes. Toward the end of the cell's discharge curve, voltage sags under that spike and drops below the amplifier's minimum operating threshold before the battery gauge registers empty. The player cuts audio or shuts down even though the indicator still shows a few percent remaining. This is a voltage sag issue, not a capacity defect — it becomes more pronounced at maximum volume settings. Reducing output volume by 20–30% near the end of a charge extends usable playback to the actual bottom of the cell's capacity.