BoostMobile 4G 5.0MP Replacement Battery 3.8V 1950mAh

BoostMobile Warp / Warp Sequent / N860 — 3.8V Li-ion Replacement Battery

This 3.8V, 1950mAh lithium-ion cell replaces the original battery in the BoostMobile 4G 5.0MP, N860, Warp, and Warp Sequent smartphones. It fits the original battery bay and connector without modification. Capacity is 1950mAh — matching the factory spec for these models.

• Warp / Warp Sequent / N860 platform fit: These models share a common 3.8V single-cell architecture and the same physical bay dimensions. The connector pinout and BMS communication protocol are consistent across the N860 and Warp lines, so one cell covers all listed variants.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the N860 platform. The BMS accepted the charge handshake without fault codes, and the protection circuit triggered correctly at the low-voltage cutoff threshold.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. The fuel gauge IC on these phones calibrates its coulomb counter against the cell's actual discharge curve — skipping this step leads to erratic percentage readings until the IC catches up over several cycles.

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

The Warp's modem and display together draw a current spike that a degraded — or freshly installed uncalibrated — cell can't sustain at low state of charge. Voltage drops faster than the fuel gauge IC predicts, and the phone shuts off to protect the cell before the reported percentage reaches zero. This is a voltage cliff, not a capacity fault. Run one full uninterrupted discharge-charge cycle without fast charging, and let the coulomb counter re-map the cell's actual voltage-to-capacity curve.

OS showing wrong battery percentage after replacement

The fuel gauge IC on the N860 and Warp Sequent stores a learned discharge curve from the old cell. After a cell swap, that stored curve no longer matches the new cell's characteristics, so the percentage display is off — sometimes by 15–20 points. The fix is one complete, uninterrupted discharge to auto-shutoff followed by a full charge to 100% with fast charging disabled. After that cycle, the IC resets its reference points against the new cell and percentage accuracy stabilises. Don't top up mid-cycle — partial cycles delay recalibration.