Tascam MP-GT1 Replacement Battery 3.7V 3400mAh

Tascam MP-GT1 — 3.7V Li-ion Replacement Battery (E01587110A)

This 3.7V 3400mAh Li-ion battery replaces the original cell in the Tascam MP-GT1 portable guitar multi-effects processor. It fits the MP-GT1 directly, covering the same amp modeling, looper, and effects processing functions the unit was shipped with. Dimensions are 68.46 × 18.50 × 18.50mm — confirm against your existing cell before ordering.

• MP-GT1 fit: The MP-GT1 draws from a single-cell 3.7V Li-ion pack with a specific connector and protection circuit. This cell matches that voltage rail and physical form factor. The BMS handshake on the MP-GT1 communicates directly with the cell's protection board, so the charge and discharge thresholds hold correctly.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the MP-GT1 platform. The BMS accepted the cell without fault codes, and the protection circuit cut in cleanly at the low-voltage threshold — no false trips during audio processing load spikes.
• Post-swap initialisation on the MP-GT1: After fitting a new cell, connect the MP-GT1 to its charger before powering on. New and stored cells can sit below the activation threshold, and the unit needs a slow trickle input first to exit deep-discharge protection before it will boot normally.

Battery percentage jumping after cell swap on the MP-GT1

After replacing the cell, the MP-GT1's fuel gauge algorithm re-references its voltage-to-capacity table against the new cell's discharge curve. Until it completes one or two full charge-discharge cycles, the percentage reading can jump — typically between 20% and 80% state of charge where the curve is flattest. This is a recalibration issue, not a fault with the cell. Run two complete cycles from full charge down to automatic cutoff, and the indicator will stabilise. If it still reads erratically after two cycles, check that the connector is fully seated and the protection board contacts are clean.

Playback cutting out before the MP-GT1 shows empty

The MP-GT1's audio amplifier stage needs a stable voltage floor to sustain output. As the cell approaches end-of-discharge, voltage sags under audio load before the battery indicator reaches zero — the amp stage drops out first. This typically happens below 3.5V under load, even though the resting voltage still reads higher. If you see this, charge the unit immediately rather than continuing to draw from the cell. Letting it cycle repeatedly at this sag point accelerates capacity fade faster than normal use.