About this replacement
Micromax Canvas Gold A300 — 3.8V Li-Polymer Replacement Battery (LWDEB16)
This is a 3.8V, 2300mAh Li-Polymer cell replacing the LWDEB16 battery in the Micromax Canvas Gold (A300) smartphone. It fits the original battery bay without modification. Voltage and physical dimensions match the OEM spec: 89.24 × 68.36 × 3.30 mm.
- Canvas Gold A300 fitment: The A300 uses a 3.8V single-cell Li-Polymer pack with a proprietary connector pinout that carries both cell voltage and thermistor signals to the charge IC. This replacement replicates that pin configuration, so the device's charging circuitry sees the correct thermistor resistance and does not flag a fault on boot.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on a Canvas Gold A300 unit. The BMS accepted the new cell without a protection trip, and the charge IC completed a full CC-CV charge cycle through to termination.
- Fuel gauge recalibration on first cycle: After installation, disable any fast-charge mode and run one full discharge down to automatic shutdown, then charge uninterrupted to 100%. This gives the fuel gauge IC one complete cycle to map the new cell's discharge curve before high-current charging pushes current into an uncalibrated state.
Why the Canvas Gold A300 reports wrong battery percentage after a cell swap
The A300's fuel gauge IC stores a learned discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches actual cell voltage behaviour. The gauge reads an old reference against a new cell and reports inaccurate percentages — often showing full charge when the cell is not, or dropping suddenly. One full discharge-charge cycle overwrites the reference and re-anchors the coulomb counter to the replacement cell's actual characteristics.
Sudden shutdown at 20–30% on the Canvas Gold A300
This happens when the cell voltage drops below the modem or display's minimum rail voltage under load — even though the gauge still shows charge remaining. It is a voltage-cliff failure: the cell cannot hold voltage when the screen backlight and radio draw current simultaneously. On a degraded original cell, this occurs because internal resistance has risen. If it appears on a new replacement cell, re-seat the battery connector and confirm no bent pins are creating contact resistance. Check that the connector clicks fully flat — a partial connection raises contact resistance and mimics an aged cell under load.