BLU Cubo N6F10T Replacement Battery 3.7V 1100mAh

BLU Cubo — 3.7V Li-ion Replacement Battery (N6F10T)

This is a 3.7V, 1100mAh Li-ion replacement battery for the BLU Cubo smartphone. It fits the Cubo directly, using OEM part number N6F10T. Swap it in when the original cell can no longer hold a full charge across a normal day.

• BLU Cubo fit: The Cubo uses a compact 46.00 × 40.10 × 6.30mm cell at 3.7V. This replacement matches that footprint and voltage rail exactly, so the BMS handshake and connector alignment carry over without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench. The BMS held cutoff correctly at both ends — no over-voltage trip at the top and clean low-voltage shutoff before the cell could be damaged.
• Fuel gauge recalibration on first use: After fitting this cell, disable fast charging and run one full discharge-to-charge cycle before normal use. The fuel gauge IC on the Cubo is calibrated against the old cell's discharge curve — one full cycle lets it remap against the new cell and report accurate percentages.

Why the BLU Cubo reports wrong battery percentage after a cell swap

The Cubo's fuel gauge IC tracks charge state using a coulomb counter tuned to the original cell's discharge curve. A new cell has a slightly different impedance profile, so the counter starts misreading state-of-charge immediately. The phone may show 80% when the cell is already near cutoff voltage, or drop from 40% to 0% without warning. One complete discharge-to-shutdown followed by a full uninterrupted charge resets the reference points the IC uses for future readings.

Sudden shutdown at 20–30% on the replacement cell

This happens when the modem or display draws a high current spike and the cell voltage drops below the BMS cutoff threshold faster than the fuel gauge can track. The percentage shown is stale — the actual cell voltage has already crossed the protection floor. It is most common in the first few cycles before the coulomb counter recalibrates. Run the recalibration cycle first; if shutdowns continue after two full cycles, check that the battery connector is fully seated and that terminal voltage at rest reads at least 3.6V.