About this replacement
Apple iPod Nano 6th Generation — 3.7V Li-Polymer Replacement Battery (616-0531)
This 3.7V, 110mAh Li-Polymer battery replaces part number 616-0531 in the iPod Nano 6th generation. It fits the compact touchscreen Nano released in 2010, the model that clips onto clothing and plays audio and video. Swap this cell when the original no longer holds adequate charge through a normal listening session.
- 6th-gen Nano compatibility: Apple used the same 616-0531 cell across the full 6th-gen Nano lineup. The connector pinout, BMS handshake voltage, and physical footprint — 35.06 × 15.49 × 2.27mm — are identical across all colour variants of that generation.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on a 6th-gen Nano unit. The BMS accepted the new cell without error, completed a full charge cycle, and the touchscreen interface responded normally throughout.
- Post-swap trickle requirement: If the Nano shipped from storage below 2.5V, the BMS will block normal charge current until a trickle phase completes. Connect the charger and leave it for at least 30 minutes before attempting to power on — this allows the protection circuit to release and the cell to recover to a safe operating voltage.
Battery percentage jumping after cell swap on the iPod Nano 6th
After replacing the cell, the Nano's charge indicator often reads inaccurately for the first few cycles. The device's voltage-threshold gauge was calibrated to the old, degraded cell's discharge curve. A fresh cell discharges on a different voltage slope, so the percentage jumps or drops unexpectedly. Run two or three full charge and discharge cycles and the indicator will recalibrate to the new cell's curve.
Playback cutting out before the battery indicator shows empty
At the tail end of the discharge curve — typically below 3.5V — the audio amplifier inside the Nano draws more current than the weakened cell can cleanly supply. Voltage sags under that load and the BMS trips, cutting power before the indicator reaches zero. This is a cell-load issue, not a firmware fault. A fresh 110mAh cell with a lower internal resistance handles the amplifier's end-of-charge current demand without sagging below the BMS cutoff threshold.