About this replacement
BlackBerry Passport / Q30 Series — 3.8V Li-Polymer Replacement Battery (BAT-58107-003)
This is a 3.8V, 3400mAh Li-Polymer replacement battery for the BlackBerry Q30, Passport, Passport 4G, and SQW100-3. It uses OEM part number BAT-58107-003 and fits the same physical footprint and connector as the original cell. If your Passport is shutting down early, failing to charge, or not powering on at all, this is the direct cell replacement.
- Passport and Q30 platform fit: The Q30 and Passport share the same battery bay dimensions, connector pinout, and BMS communication protocol — that is why one cell covers both devices. The fuel gauge IC on both boards reads the same NTC thermistor and charge state data from this pack.
- Bench tested on actual hardware: We cycled this cell on a Passport board and confirmed the BMS handshake completes correctly — charge IC accepted the pack without fault flags, and the fuel gauge IC began tracking state-of-charge from the first 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 recalibrate against the new cell's discharge curve before high-current charging pushes current into an uncalibrated pack.
Sudden shutdown at 20–30% on the BlackBerry Passport after a cell swap
This happens because the fuel gauge IC is still calibrated to the old cell's voltage-to-capacity curve. The new cell hits a voltage cliff under modem or screen load at a different point than the old cell did. The board reads that voltage drop as a critical low and cuts power — even though the displayed percentage looks safe. One full discharge-charge cycle with fast charging off resets the coulomb counter and maps the new cell correctly.
BlackBerry Passport not powering on after sitting in storage
If the original cell drained below roughly 2.5V per cell during storage, the BMS locks out to prevent damage — and the board will not power on even when plugged in. Connect the device to a low-current charger at 5V and leave it for 20–30 minutes before attempting to power on. The BMS needs to see a trickle charge above its recovery threshold before it allows the main charge circuit to engage. If the board still shows no charge indicator after 30 minutes, the original cell has failed below recovery and replacement is the only fix.