RCA Lyra X2400 Replacement Battery 3.7V 1800mAh RD2400A-BAT

RCA Lyra X2400 — 3.7V Li-ion Replacement Battery (RD2400A-BAT)

This is a 3.7V, 1800mAh Li-ion replacement battery for the RCA Lyra X2400 portable media player. It matches the OEM part number RD2400A-BAT and fits the X2400 directly. Install it when the original cell no longer holds a charge or the player shuts down mid-use.

• Lyra X2400 fit: The X2400 uses a single-cell Li-ion pack at 3.7V nominal. The connector pinout and physical dimensions — 53.00 × 35.30 × 11.00mm — match the OEM cell, so no modification is needed to seat this battery in the original bay.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the X2400 platform and confirmed the BMS handshake completes correctly. The protection circuit trips at the expected low-voltage cutoff without freezing the firmware.
• First charge after install: Media players coming out of storage often sit in deep discharge protection. After fitting this battery, connect the charger and leave it for at least 30 minutes before attempting to power on — the device needs trickle current to exit the protection state before it accepts a normal charge cycle.

Battery percentage jumping after cell swap on the Lyra X2400

The X2400 reads battery level by measuring cell voltage against fixed thresholds stored in firmware. A new cell has a slightly different discharge curve than a worn original, so the indicator recalibrates over the first few cycles. Expect the percentage to jump or drop suddenly — especially between 60% and 20% — for the first two to three full charge cycles. Run the battery down to auto-shutdown and charge it fully each time; the indicator stabilises once the firmware has mapped the new cell's curve.

Playback cutting out before the battery indicator shows empty

The audio amplifier inside the X2400 draws a brief current spike every time it drives headphone output at higher volumes. Near the end of discharge — typically below 3.5V — the cell can no longer supply that spike without the voltage sagging below the amplifier's operating floor. The player interprets this as a fault and cuts audio before the battery indicator reaches zero. This is a voltage-sag issue, not a capacity defect. If it happens consistently, check that the charge cycle completes fully to 4.2V before each use.