About this replacement
SanDisk Sansa Clip Sport — 3.7V Li-Polymer Replacement Battery (SDMX24)
This 3.7V, 220mAh lithium-polymer battery is a direct replacement for the SanDisk Sansa Clip Sport portable media player (SDMX24). It restores the device's ability to hold a charge after the original cell degrades from repeated charge cycles. Dimensions are 32.35 × 24.80 × 3.60mm — verify against your existing cell before installing.
- Sansa Clip Sport compatibility: The SDMX24 platform runs a single-cell Li-Polymer rail at 3.7V nominal. All Clip Sport units share the same connector pinout and BMS handshake, so this cell fits across the Clip Sport lineup without modification.
- Bench tested on actual hardware: We ran this cell on the Clip Sport board and confirmed the BMS accepted the new cell without triggering a protection lockout. Voltage at delivery measured within the expected 3.6–3.85V shipping range.
- Post-swap charge cycle: After installing, connect the Clip Sport to its charger and leave it for a full charge before powering on. Media players store in a discharged state, and the BMS may need a slow trickle input before it accepts normal charge current — skipping this step can cause the device to appear dead even with a good cell fitted.
Battery percentage jumping after cell swap on the Clip Sport
The Clip Sport's fuel gauge reads battery state by tracking voltage thresholds, not true coulomb counting. After a cell swap, the firmware's stored voltage curve no longer matches the new cell's actual discharge profile. This causes the indicator to jump — sometimes from 80% to 20% in a single track. Run two or three full charge-to-discharge cycles and the gauge will recalibrate to the new cell's curve.
Playback cutting out before the battery indicator shows empty
At the tail end of a Li-Polymer discharge curve, cell voltage drops sharply. The Clip Sport's audio amplifier pulls enough current during playback that this voltage sag trips the under-voltage cutoff before the display gauge reaches zero. This is a BMS protection response, not a faulty cell. Charge the device and confirm the resting voltage sits at or above 3.7V before the next use.