Nova SmartNOVA 3.7V 1200mAh Li-ion Compatible Battery

Nova SmartNOVA — 3.7V Li-ion Replacement Battery

This is a 3.7V, 1200mAh Li-ion replacement battery for the Nova SmartNOVA smartphone. It fits devices where the original cell has degraded and can no longer hold adequate charge for daily use. Dimensions are 53.00 x 33.90 x 5.70mm — confirm these against your existing cell before installing.

• SmartNOVA fit: No OEM part number is published for this cell. Match against the original battery's physical dimensions and the 3.7V voltage rating printed on the cell label before swapping.
• Bench tested on actual hardware: We ran charge and discharge cycles on this cell and confirmed the BMS accepts a standard 4.2V CC/CV charge profile. The protection circuit tripped correctly at the low-voltage cutoff, and charge termination occurred without incident at full capacity.
• Fuel gauge recalibration on first use: After installation, disable fast charging and run one complete discharge-to-charge cycle at standard rate. This lets the SmartNOVA's fuel gauge IC map the new cell's discharge curve before any high-current charging is applied to an uncalibrated cell.

Why the SmartNOVA reports wrong battery percentage after a cell swap

The SmartNOVA uses a fuel gauge IC that builds a discharge model based on the old cell's internal resistance and capacity curve. When a new cell goes in, that model is stale. The gauge reads voltage and translates it to a percentage using the old curve, so the number on screen can be off by 10–20%. One full discharge below 5% followed by a complete charge resets the coulomb counter and lets the IC relearn the new curve. After that cycle, percentage accuracy returns to normal.

Sudden shutdown at 20–30% on the replacement cell

This happens when the fuel gauge IC hasn't calibrated yet and the phone's reported percentage is higher than the cell's actual state of charge. Under modem or screen load, the cell voltage drops sharply at a point the OS doesn't expect, and the phone shuts off to protect the cell. It's not a faulty battery — it's an uncalibrated gauge. Run the phone down to below 5% without interruption, then charge fully to 100% in one unbroken cycle. After that, the cutoff voltage threshold the OS uses will align with the new cell and the sudden shutdowns stop.