Kenwood MiniDisc Player Compatible Battery 3.7V 2400mAh

Kenwood MiniDisc Players — 3.7V Li-ion 2400mAh Replacement Battery (CS-NB111)

This is a 3.7V, 2400mAh Li-ion replacement battery for Kenwood MiniDisc players. It replaces the original cell in aging portable MiniDisc units where the factory battery no longer holds a usable charge. Dimensions are 71.00 × 19.70 × 19.70mm — confirm these against your existing cell before ordering.

• MiniDisc player compatibility: Kenwood's portable MiniDisc lineup shares a common 3.7V single-cell Li-ion format across models. The battery bay dimensions and connector orientation are consistent within this series, so one cell fits the range without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench. The BMS handled charge termination cleanly at full voltage and showed stable output through the disc-spin and laser-read load spikes typical of MiniDisc mechanisms.
• MiniDisc laser sled load tip: The optical head in a MiniDisc player draws a short current spike each time it seeks across the disc. If your player intermittently stops or skips on a new battery, run one full charge cycle through the device itself — this lets the onboard charge circuit calibrate to the new cell's internal resistance profile.

Why MiniDisc players cut out during playback on a new cell

The MiniDisc laser and spindle motor pull current in short, sharp bursts every time the head repositions or the disc changes speed. A new Li-ion cell with slightly elevated internal resistance can trigger the BMS undervoltage cutoff during these spikes, even when the battery reads partially charged. This is not a fault with the cell — it is the BMS responding to a momentary voltage dip below its cutoff threshold. Run two or three full charge-discharge cycles to condition the cell and lower its internal resistance before treating any cutout as a failure.

Battery percentage reading frozen or jumping after swap

Kenwood MiniDisc players map battery level using voltage thresholds calibrated to the original cell's discharge curve. A replacement cell with a slightly different curve causes the indicator to freeze at a fixed segment or jump between levels inconsistently. The display is not broken — the fuel gauge is reading real voltage, just interpreting it against an old map. After one complete charge cycle from within the player, most units recalibrate and the readout tracks accurately down to 3.0V cutoff.