Audioline MT1000 Compatible Battery 3.7V 1200mAh Li-ion

Audioline MT1000 — 3.7V Li-ion Replacement Battery (MT1000)

This 3.7V Li-ion cell delivers 1200mAh (4.44Wh) to the Audioline MT1000 smartphone. It replaces the original battery when capacity has dropped or the cell no longer holds a charge. Dimensions are 53.20 × 34.00 × 5.70mm — verify against your existing cell before fitting.

• MT1000 platform fit: The MT1000 runs a fixed 3.7V nominal rail with a standard Li-ion BMS handshake. This cell matches that voltage and connector, so the charge IC recognises it without a firmware workaround.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a test rig, confirming the BMS communicates correctly with the charge IC and that protection cutoffs trigger at the expected thresholds.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one full discharge-charge cycle at standard current. This lets the fuel gauge IC map its coulomb counter to the new cell's actual discharge curve before any high-current charging begins.

Why the MT1000 reports wrong battery percentage after a cell swap

The MT1000 uses a fuel gauge IC that tracks charge state by counting coulombs against a stored discharge curve from the original cell. When you fit a new cell, that stored curve no longer matches the physical cell chemistry. The gauge reports percentages based on old data until it recalibrates. One complete discharge to auto-shutoff followed by a full charge at standard current rewrites the reference curve and restores accurate readings.

Sudden shutdown at 20–30% on the MT1000 after replacement

This happens when the cell voltage drops sharply under peak load — typically the modem transmitting or the screen at full brightness — faster than the fuel gauge predicts. The phone shuts down because cell voltage hits the BMS low-voltage cutoff while the gauge still shows remaining capacity. It is a calibration gap, not a faulty cell. Run two full discharge-charge cycles and the gauge will align its low-voltage threshold correctly, typically around 3.0–3.2V under load.