iRiver IPF550 Replacement Battery 3.7V 950mAh HA603048

iRiver IPF550 / IPF990 / IPF595 — 3.7V Li-Polymer Replacement Battery (HA603048)

This is a 3.7V, 950mAh lithium-polymer replacement battery for the iRiver IPF550, IPF990, and IPF595 portable media players. It matches the original HA603048 cell on voltage, capacity, and connector spec. When the original cell degrades and the player can no longer hold a charge through a full listening session, this replaces it directly.

• IPF550 / IPF990 / IPF595 compatibility: These three models share the same battery bay dimensions and connector pinout, and all run off the same 3.7V single-cell supply rail. The HA603048 form factor — 50.30 × 30.00 × 5.80mm — fits all three without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the IPF platform. The BMS accepted the new cell without error flags, voltage regulation held steady through audio output, and the protection circuit tripped correctly at the low-voltage threshold rather than allowing an uncontrolled cutoff.
• First charge after installation: Media players in deep discharge protection mode often reject a normal charge current immediately after a cell swap. Connect the player to its charger and leave it for at least 30 minutes before attempting to power it on — this allows the trickle charge stage to bring the cell above the BMS re-entry threshold.

Battery percentage jumping after swapping the HA603048 cell

The IPF series uses a voltage-threshold method to estimate state of charge. After a cell swap, the player's internal reference points no longer match the new cell's discharge curve. You'll see the percentage counter jump, skip, or read 100% until the player drains close to empty. Run two full charge and discharge cycles without interruption and the indicator will recalibrate to the new cell's actual voltage profile.

Playback cutting out before the battery indicator reaches empty

The audio amplifier circuit in these players draws a short high-current burst when output voltage is pushed. Near the end of discharge, a degraded or undersized cell can't sustain that burst without voltage sagging below the amplifier's minimum operating point — so playback stops even though the indicator still shows charge remaining. This battery matches the original 950mAh rating, which keeps the cell above that sag threshold through the full discharge curve. If cutout still occurs, check that the cell connector is fully seated, as a loose contact adds resistance and worsens sag at the same draw level.