BoostMobile WARP 4G Replacement Battery 3.8V 2000mAh

BoostMobile Warp 4G / N9510 — 3.8V Li-ion Replacement Battery

This 3.8V, 2000mAh Li-ion cell replaces the original battery in the BoostMobile Warp 4G (N9510) smartphone. It fits the same battery bay and connects to the same charge IC and fuel gauge circuit as the factory cell. Capacity is 2000mAh (7.6Wh) — matching the original spec.

• Warp 4G / N9510 fit: Both model references share the same mainboard, battery connector pinout, and BMS handshake. One cell fits both. No adapter or wiring change needed.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the N9510 platform. The BMS accepted charge termination cleanly and the protection circuit tripped correctly at low-voltage cutoff — no false triggers during the modem-active load test.
• Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging begins on an uncalibrated cell.

Sudden shutdown at 20–30% on the Warp 4G after a cell swap

This is a voltage cliff issue, not a capacity defect. The fuel gauge IC still holds calibration data from the old cell's discharge curve, so its percentage reading diverges from actual cell voltage under load. When the modem or screen pulls current, the new cell's voltage drops below the shutdown threshold before the OS registers a low-battery warning. One full discharge-charge cycle at standard rate resets the coulomb counter against the new cell and the shutdowns stop.

Phone stays on charging screen but percentage never climbs past 1–2%

A replacement cell stored below 2.5V per cell triggers the BMS lockout — the protection circuit blocks charge current to prevent damage to a deeply discharged lithium cell. The phone may show a charging animation but the charge IC cannot push current through the locked BMS. Connect the phone to a wall adapter (not USB from a PC) and leave it undisturbed for 20–30 minutes. The BMS trickle-charge recovery circuit needs a stable 5V source to bring the cell back above 2.9V and release the lockout.