Philips GoGear SA6015 Replacement Battery 3.7V 800mAh

Philips GoGear SA6015 / SA6025 Series — 3.7V Li-Polymer Replacement Battery

This 3.7V 800mAh (2.96Wh) Li-Polymer cell replaces the original battery in the Philips GoGear SA6015, SA6025, SA6025/97, and SA6025/37 portable media players. It matches the original cell's flat-pack form factor at 49.92 × 34.28 × 4.93mm, so it fits the internal cavity without modification. Capacity is drawn from the product specification, not estimated.

• SA6015 and SA6025 shared battery platform: Both models use the same flat Li-Polymer cell voltage rail and connector pinout. Philips carried the same battery footprint across these GoGear variants, so one cell covers the full group without adapter wiring or connector swaps.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the SA6025 platform. The BMS accepted the cell without triggering a fault, stepped through each charge phase correctly, and held the cut-off voltage at the expected 4.2V ceiling.
• Post-install first charge on GoGear players: If the player sat unused for months before the swap, connect it to the USB charger immediately after installing the new cell and leave it for a full uninterrupted charge cycle. GoGear units can enter a low-voltage protection state that blocks normal boot until the cell climbs past the minimum threshold from a slow trickle.

GoGear SA6025 battery percentage jumping after a cell swap

After fitting a new Li-Polymer cell, the on-screen battery indicator often skips — showing 80%, then 60%, then 95% across short playback windows. This is normal. The GoGear firmware tracks battery level using voltage thresholds calibrated to the original cell's discharge curve, and a fresh cell's curve sits slightly outside those stored reference points. Run two or three full charge-to-drain cycles and the indicator stabilises as the firmware re-maps to the new cell's actual voltage behaviour.

Playback cutting out before the battery indicator reaches empty

This happens at the tail end of a degraded cell's discharge curve. The audio amplifier inside the SA6015 draws a short burst of current to drive the headphone output, and an ageing cell can't hold voltage steady under that brief spike. The BMS reads the voltage dip as a low-cell event and shuts the device down even though the displayed percentage hasn't hit zero. Fitting a fresh 800mAh cell restores the voltage buffer that keeps the amplifier stable through that final discharge window.