About this replacement
KAZAM Tornado 348 / Thunder 348 — 3.8V Li-ion Replacement Battery (BL0001484)
This is a 3.8V, 2050mAh Li-ion cell that replaces the original BL0001484 battery in the KAZAM Tornado 348 and Thunder 348 smartphones. It fits both models because they share the same battery bay dimensions and connector pinout. Capacity is 2050mAh — matching the original factory spec.
- Tornado 348 and Thunder 348 compatibility: Both models use the same BL0001484 cell with identical voltage rail, connector layout, and BMS communication lines — one battery covers both without modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Tornado 348 platform. The BMS handshake completed correctly on first connection, and the charge IC accepted current without flagging a fault state.
- 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 into an uncalibrated cell.
Sudden shutdown at 20–30% on the Tornado 348 after a cell swap
The Tornado 348 fuel gauge IC holds a discharge curve from the old, degraded cell. When a new cell goes in, the IC underestimates how much voltage the new cell still holds at low percentages. Under modem or display load, the phone sees a voltage it thinks signals empty and cuts off — even though charge remains. One full discharge-to-shutdown followed by an uninterrupted charge to 100% forces the coulomb counter to relearn the new cell's curve. After that cycle, shutdowns at 20–30% should stop.
Phone warm near the battery during the first charge after replacement
A new high-impedance cell generates more heat during the first few charge cycles than a worn-in cell does. The charge IC on the Tornado 348 pushes current into higher internal resistance, and that converts to heat at the cell surface. This is normal for the first two or three cycles and tapers off as internal resistance drops. If the phone stays warm beyond the third full charge, check that the battery connector is fully seated — a partial connection raises contact resistance and keeps heat elevated.