About this replacement
Sony NWZ-Z1050 Series — 3.7V Li-Polymer Replacement Battery (LIS1484MHPPC)
This is a 3.7V, 1300mAh Li-Polymer replacement battery for the Sony NWZ-Z1050, NWZ-Z1050N, NWZ-Z1060, and NWZ-Z1070 Walkman digital audio players. It uses OEM part number LIS1484MHPPC and matches the original cell's dimensions at 63.15 x 41.70 x 4.30mm. Install it when the original battery no longer holds a charge or the player shuts down unexpectedly during playback.
- NWZ-Z1050 / Z1060 / Z1070 compatibility: All four models in this series share the same battery bay geometry, connector pinout, and BMS handshake protocol. Swapping between them uses the same cell without any firmware conflict or connector modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the NWZ-Z1050 platform. The BMS accepted charge current from cold start without triggering protection cutoff, and cell voltage held stable through full discharge without dropout at the amplifier rail.
- Post-installation charge cycle: After fitting a new cell, charge the player to 100% before first playback. The NWZ-Z1000 series calibrates its battery indicator against a full charge reference — skipping this step causes the percentage display to jump erratically during early cycles.
Battery percentage jumping after cell swap on the NWZ-Z1050
The NWZ-Z1000 series uses a voltage-threshold method to estimate charge state. After a cell swap, the firmware has no reference data for the new cell's discharge curve, so the percentage counter recalibrates in real time as it maps voltage to capacity. This produces sudden jumps — 60% dropping to 30% in seconds — during the first few cycles. Run two full charge-to-discharge cycles and the indicator stabilises.
Playback cutting out before the battery indicator reaches zero
The audio amplifier in the NWZ-Z1050 draws a spike of current at the end of each track buffer reload. When cell voltage sags below roughly 3.4V near end of discharge, that current spike drops the rail low enough for the BMS to trigger a protection cutoff — even though the display still shows a few percent remaining. This is a cell chemistry behaviour, not a firmware fault. Connecting the charger immediately restores the device; the remaining cell capacity below 3.4V is simply not accessible under amplifier load.