Tascam BP-L2 Replacement Battery 3.7V 1800mAh Li-ion

Tascam DR-1 / GT-R1 — 3.7V Li-ion Replacement Battery (BP-L2)

This is a 3.7V 1800mAh Li-ion replacement for the Tascam BP-L2 battery. It fits the DR-1 portable digital audio recorder and the GT-R1 guitar/bass recorder. Both devices share the same battery bay dimensions, connector pinout, and voltage rail.

• DR-1 and GT-R1 compatibility: Both recorders run on the same 3.7V single-cell Li-ion platform with matching 53 × 34 × 10.90mm form factor. The battery management system communicates the same way across both models — no firmware or connector differences to work around.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the DR-1. The BMS responded correctly to both the recorder's charge termination signal and its low-voltage cutoff threshold — no false trips, no charge rejection.
• Pre-session charge requirement: Charge this battery fully before a recording session. The DR-1 writes audio data continuously to flash storage. If voltage drops below the recorder's cutoff mid-write, the active file header does not close cleanly and the recording becomes unreadable.

Recording stops mid-session on the DR-1

The DR-1 monitors cell voltage in real time while recording. When voltage sags below approximately 3.2V under load, the recorder halts the write process to protect the flash storage controller. If the battery is already partially depleted before a session starts, this cutoff can trigger sooner than expected — not because the cell is faulty, but because sustained recording draw accelerates voltage sag. Always start long sessions from a full charge to keep cell voltage above the cutoff threshold throughout.

DR-1 won't start after a battery swap

A new or long-stored Li-ion cell can self-discharge to a voltage below the DR-1's boot threshold — typically under 3.0V. The recorder will not power on from this state even though the battery is not damaged. Connect the DR-1 to USB or the AC adapter and leave it charging for at least 15–20 minutes before attempting to power on. Once the cell rises above 3.0V, the recorder will boot and charge normally.