Samsung Napster MP3 Replacement Battery 3.7V 1600mAh

Samsung Napster MP3 Player — 3.7V Li-Polymer Replacement Battery (PCF345385A)

This 3.7V, 1600mAh lithium-polymer battery replaces part number PCF345385A in the Samsung Napster MP3 player. It fits the YP106G, PMPSGY910, and Y910 models. Swap it in when the original cell no longer holds enough charge to sustain normal playback.

• YP106G / Y910 / PMPSGY910 platform: These models share the same PCF345385A cell footprint, connector pin-out, and BMS handshake protocol. One battery covers all three variants without wiring modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Napster platform. The BMS accepted charge current normally, balanced within expected parameters, and reported state-of-charge consistently through the firmware's battery indicator.
• Post-install charge cycle: After fitting a new cell, connect the player to its charger and let it reach 100% before first playback. Media players frequently enter a deep-discharge protection state during storage — a full trickle charge before use allows the BMS to establish an accurate baseline for the state-of-charge gauge.

Battery percentage jumping after a cell swap on the Napster

Samsung's Napster firmware tracks battery state using voltage thresholds stored against the previous cell's discharge curve. A new cell with a slightly different internal resistance will read those thresholds differently, causing the indicator to jump — say, from 60% to 20% in minutes. This is not a faulty battery. The fix is two full charge-discharge cycles, which forces the firmware to recalibrate its voltage-to-percentage mapping against the new cell. After the second full cycle, the indicator stabilises and tracks accurately.

Playback cutting out before the battery indicator reaches empty

The audio amplifier inside the Napster draws a short current spike when processing dynamic audio — loud passages, bass-heavy tracks. At the low end of the discharge curve, cell voltage can sag below the amplifier's minimum operating threshold during these spikes, triggering a shutdown even when the indicator still shows charge remaining. This is a voltage-sag issue, not a capacity defect. If it happens consistently, check that the connector is fully seated — a partially connected cell increases contact resistance and makes sag worse at the terminal. A secure, clean connection keeps the voltage at the amplifier above the cutoff point.