NET10 Midnight 3.7V 1500mAh Li-Ion Replacement Battery

NET10 Midnight — 3.7V Li-ion 1500mAh Replacement Battery

This is a 3.7V, 1500mAh Li-ion battery for the NET10 Midnight smartphone. It replaces a degraded or failed original cell and restores normal phone operation. Dimensions are 49.00 × 47.80 × 5.50mm — confirm your original cell matches before fitting.

• NET10 Midnight fit: The Midnight uses a compact flat-cell format with a low-current BMS tuned to a 1500mAh cell. Swapping to a cell outside that capacity range trips the charge controller, so this replacement matches the original spec exactly.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on a matched load. The BMS held charge termination at 4.2V and the protection circuit tripped cleanly at low-voltage cutoff without false positives mid-cycle.
• 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 pushes current into an uncalibrated state.

Sudden shutdown at 20–30% on the replacement cell

A new cell has a slightly different voltage-vs-capacity curve than the original. The fuel gauge IC still uses the old curve, so it reads 25% while the actual cell voltage has already hit the low-voltage cliff under modem or screen load. The phone cuts out because the BMS sees a real undervoltage event, even though the percentage display says otherwise. Run one full discharge to near-zero, then a full charge to 100% — this forces the coulomb counter to reset against the new cell's actual curve.

Phone warm near the battery during the first charge

A fresh cell starts with higher internal impedance than a conditioned one. The charge IC pushes current into that resistance, and some energy converts to heat rather than stored charge. This is normal for the first one or two cycles and settles as the cell conditions. If the phone stays warm past the third full charge, check that the charge port is fully seated and no background apps are running a sustained CPU load during charging.