Nova SmartNOVA 3.7V Compatible Battery 750mAh Li-ion

Nova SmartNOVA — 3.7V Li-ion Replacement Battery

This is a 3.7V 750mAh Li-ion replacement battery for the Nova SmartNOVA smartphone. It fits directly into the SmartNOVA and restores power when the original cell has degraded past useful capacity. Capacity is 750mAh (2.78Wh) — matching the stock specification for this model.

• SmartNOVA fit: The SmartNOVA uses a compact 53.00 × 33.90 × 5.70mm cell footprint with a low-current BMS tuned for the phone's modem and display draw. This replacement matches that footprint and voltage rail, so the phone's charge IC recognises the cell correctly.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench. The BMS held cutoff voltage correctly at both ends — no premature trip on load, and protection kicked in cleanly at low-voltage threshold.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging begins against an uncalibrated coulomb counter.

Sudden shutdown at 20–30% on the SmartNOVA after a cell swap

This happens because the fuel gauge IC is still running the discharge curve from the old, degraded cell. The new cell has a steeper voltage cliff at low charge states — the phone underestimates remaining charge and shuts down when the modem or screen pulls current. One full discharge-charge cycle without fast charging lets the coulomb counter remap to the new cell's actual curve. After that cycle, shutdown should occur at or below 5% as expected.

OS reporting erratic or wrong battery percentage after replacement

The SmartNOVA's fuel gauge IC stores a learned model of the battery's internal resistance and discharge slope. When a new cell goes in, that stored model no longer matches. The percentage reading jumps or stalls because the IC is comparing live voltage data to the wrong reference. Drain the phone to auto-shutdown, then charge uninterrupted to 100% — this forces the IC to write a fresh calibration point and stabilises the percentage readout.