Marantz PMD-901V Replacement Battery SPY114648 3.7V 2900mAh

Marantz PMD-901V — 3.7V Li-Polymer Replacement Battery (SPY114648)

This is a 3.7V, 2900mAh lithium-polymer battery for the Marantz PMD-901V portable digital recorder. It replaces OEM part SPY114648 and fits directly into the PMD-901V battery bay. Capacity figures come from the product data — 10.73Wh total.

• PMD-901V battery bay fit: The PMD-901V uses a single lithium-polymer cell at 3.7V nominal. This cell matches the voltage rail, connector orientation, and physical dimensions — 47.15 × 45.60 × 10.70mm — required by that recorder chassis. No modification needed.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a PMD-901V unit. The BMS accepted the cell without fault flags, voltage held stable under sustained recording load, and the recorder's battery indicator tracked accurately across the full state-of-charge range.
• First-use initialisation on the PMD-901V: After fitting a new cell, power on the recorder and let it complete its startup sequence before beginning a session. The PMD-901V reads battery state during boot — an interrupted startup can cause the indicator to display an inaccurate charge level until the next full cycle.

PMD-901V battery indicator stuck at low after a full charge

The PMD-901V samples battery voltage during boot to set its initial gauge reading. If the recorder was powered on before the new cell had time to settle after installation, the gauge can lock to a low reading even when the cell is fully charged. This is a calibration issue, not a cell fault. Discharge the battery fully until the recorder shuts itself off, then charge uninterrupted to 100% — the gauge resets after one complete cycle and should read accurately from 4.2V down.

PMD-901V stops recording mid-session without warning

Lithium-polymer cells have a hard BMS undervoltage cutoff — on a 3.7V nominal cell, protection typically trips below 3.0V. If a cell has been through many shallow cycles, capacity fade means the usable voltage window narrows faster than the indicator suggests. The recorder cuts power abruptly when the BMS trips rather than showing a low-battery warning, because there is no buffer left. Check resting voltage with a multimeter — a healthy cell at partial charge should sit above 3.6V; anything below that at rest points to a degraded cell that needs replacement.