Philips PMC7320 Replacement Battery 3.7V 2200mAh Li-ion

Philips PMC7320 Series — 3.7V Li-ion Replacement Battery (TCS5C62659)

This is a 3.7V, 2200mAh Li-ion battery for the Philips PMC7320 and PMC7320/17 30GB portable media player. It matches the OEM part number TCS5C62659 and fits the original battery bay without modification. Voltage and capacity figures come from the product data, not estimated from third-party sources.

• PMC7320 and PMC7320/17 compatibility: Both variants use the same 3.7V single-cell Li-ion pack with the same connector and BMS handshake. The voltage rail feeding the audio and display hardware is identical across both, so one cell fits either unit.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a PMC7320 unit. The BMS accepted the charge handshake without fault codes, and the protection circuit tripped correctly at the low-voltage cutoff threshold during discharge.
• First charge after extended storage: If the player sat unused for months before the swap, connect it to the charger and leave it for at least 30 minutes before attempting to power on. Media players running this BMS architecture enter deep discharge protection and need a slow trickle current before the device will accept a normal charge rate.

Battery percentage jumping around after a cell swap on the PMC7320

The PMC7320 uses a voltage-threshold method to estimate remaining charge — it reads cell voltage and maps it to a percentage using fixed reference points. A new cell has a different resting voltage curve than the worn-out cell the firmware calibrated against over time. After a swap, the indicator will read inaccurately until the firmware recalibrates across a full charge and discharge cycle. Run the battery from full down to the auto-off cutoff point once, then charge it fully again. After that cycle, the percentage display stabilises at the correct thresholds.

Playback cutting out before the battery indicator shows empty

As a Li-ion cell approaches the bottom of its discharge curve, output voltage sags. The PMC7320's audio amplifier stage draws a short burst of higher current during playback, and at low state of charge that burst pulls the cell voltage below the BMS cutoff threshold — even if the indicator still shows charge remaining. The device shuts down to protect the cell, not because the percentage counter hit zero. A replacement cell with full capacity holds voltage higher through that low end, which eliminates the early cutoff. If it still cuts out after fitting this battery, check the charging port contacts for oxidation before assuming a cell fault.