NET10 Paragon 3.8V Replacement Battery 1750mAh Li-Polymer

NET10 Paragon / Paragon 4G (Z753G / NTZEZ753G3P5P) — 3.8V Li-Polymer Replacement Battery

This is a 3.8V, 1750mAh Li-Polymer cell built to replace the original battery in the NET10 Paragon and Paragon 4G smartphones. It fits models Z753G and NTZEZ753G3P5P. Capacity is rated at 6.65Wh and matches the original cell footprint at 72.02 × 47.58 × 4.04mm.

• Paragon and Paragon 4G fit group: Both the Z753G and NTZEZ753G3P5P share the same battery bay dimensions, connector pinout, and charge IC handshake — they pull from the same cell specification, so one SKU covers the full model range.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Paragon platform. The BMS accepted the charge IC handshake without rejection, voltage held stable under combined screen and modem load, and the protection circuit tripped correctly at the low-voltage cutoff threshold.
• Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging and run one full discharge-to-charge cycle. The fuel gauge IC needs to map the new cell's discharge curve before it can report accurate percentages — skipping this step causes erratic readings for the first several days of use.

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

The Paragon's fuel gauge IC stores a discharge curve calibrated to the original cell. When a new cell goes in, the stored curve no longer matches the actual voltage-to-capacity relationship of the replacement. The phone sees an apparent voltage cliff — the cell voltage drops faster under modem or screen load than the IC predicts — and the OS triggers a protective shutdown before the displayed percentage reaches zero. One complete discharge cycle, draining the phone until it powers off on its own, followed by a full uninterrupted charge, forces the coulomb counter to relearn the new cell's curve. After that cycle, the 20–30% shutdowns stop.

Phone feels warm near the battery during the first few charges

A fresh Li-Polymer cell has higher internal impedance than a cell that has been cycled. The charge IC pushes current into that higher impedance, and the extra resistance converts some energy to heat at the cell surface. This is normal for the first two or three charge cycles and resolves as impedance drops with use. If the phone becomes uncomfortably hot or charging stops before 100%, let the device cool to room temperature, then restart the charge — the charge IC will resume from where it left off rather than starting a new cycle.