Insignia NS-4V24 Replacement Battery 3.7V 560mAh

Insignia NS-4V24 / NS-8V24 — 3.7V Li-Polymer Replacement Battery (E4H04-1-R)

This 3.7V 560mAh Li-Polymer battery replaces the OEM E4H04-1-R cell in the Insignia NS-4V24 and NS-8V24 portable media players. Both models run the same voltage rail, connector, and BMS configuration, so one cell covers both. Capacity is 560mAh (2.07Wh) — matching the original spec from Insignia.

• NS-4V24 and NS-8V24 compatibility: Both models share the same physical footprint (50.50 × 32.50 × 4.00mm), connector orientation, and BMS communication protocol. The same cell works across both without modification.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge passes on the NS-series platform. The BMS accepted charge current normally and the low-voltage cutoff triggered at the correct threshold — no false trips or charge rejection.
• First-use charging on NS-series players: After a cell swap, connect the player to its charger before powering it on. Cells stored in transit often sit at low voltage. The NS-series protection circuit blocks startup below a certain threshold, so a short pre-charge clears that state before you try to boot the device.

Battery percentage jumping after cell swap on the NS-4V24

The NS-series fuel gauge reads voltage and maps it to a percentage using fixed thresholds calibrated to the original cell's discharge curve. A new cell has a slightly different resting voltage at each state of charge until it completes a few full cycles. This mismatch causes the indicator to jump — common readings include a sudden drop from 80% to 20% or a flat line near the top. Run two or three full charge-to-discharge cycles and the gauge settles back to accurate readings.

Playback cutting out before the battery indicator shows empty

The audio amplifier in compact media players draws a short current spike when it drives the output stage. Near the end of a cell's discharge curve — typically below 3.5V — the cell's internal resistance causes the voltage to sag under that load spike. The BMS reads this as an undervoltage fault and cuts power to protect the cell, even though the percentage gauge still shows a charge remaining. If this happens consistently, the cell may have accumulated resistance from deep discharge events — check that the device never sits fully discharged for extended periods.