Tegra 4 Smartphone Compatible Battery 3.8V 2300mAh

Tegra Model 4 Smartphone — 3.8V Li-ion Replacement Battery

This Tegra battery replaces the original cell in the Model 4 smartphone. It runs at 3.8V with a 2300mAh (8.74Wh) capacity using Li-ion chemistry. Physical dimensions are 72.90 × 53.60 × 4.70mm — verify your existing cell before ordering.

• Model 4 fitment: This cell matches the voltage rail and connector pinout for the Model 4. The BMS communicates with the phone's charge IC over the same data line as the factory cell, so the handshake clears on first boot.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Model 4 platform. The BMS held the charge termination voltage correctly and did not trip the phone's overcurrent protection during load steps.
• First-cycle fuel gauge recalibration: On first use after installation, disable fast charging and run one full discharge-to-charge cycle. The fuel gauge IC learns the new cell's discharge curve before high-current charging is applied to an uncalibrated cell — skipping this causes percentage jumps for the first several cycles.

Why the Model 4 reports wrong battery percentage after a cell swap

The Model 4 uses a coulomb counter that builds its reference model against the original cell's discharge curve. When a new cell goes in, the stored curve no longer matches actual cell behaviour. The fuel gauge IC then projects state-of-charge using stale data, which produces readings that lag or jump. One full slow-charge cycle without fast charging gives the coulomb counter enough data to converge on an accurate curve for the new cell.

Sudden shutdown at 20–30% remaining on the new cell

This happens when the cell voltage drops sharply under a sudden load — typically the LTE modem or a screen brightness spike. The BMS reads a voltage cliff and cuts power before the OS can log a low-battery event, so the shutdown looks random. It is most common on a new cell that has not yet completed a calibration cycle. Run the phone down to 5% under normal use, charge to 100% without interruption, and the fuel gauge will remap the cliff point accurately — check that the resting voltage at 30% reads above 3.65V after the cycle.