KAZAM Tornado 2 Replacement Battery KTT50 3.8V 1700mAh

KAZAM Tornado 2 / Tornado2 5.0 — 3.8V Li-Polymer Replacement Battery (KTT50)

This is a 3.8V, 1700mAh Li-Polymer battery for the KAZAM Tornado 2 and Tornado2 5.0 smartphones. It replaces OEM part numbers KTT50 and KTT50-GHABD002643. The cell fits the original battery bay and connects to the same BMS contact points as the factory unit.

• Tornado 2 and Tornado2 5.0 fit: Both variants share the same physical footprint, connector pitch, and 3.8V nominal rail. One cell covers both. No adapter or modification is needed.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Tornado 2 platform. The BMS accepted handshake on first power-on, and the charge IC stepped through CC/CV phases without fault codes.
• Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging and run one full discharge-to-charge cycle. The phone's fuel gauge IC was calibrated to the old cell's discharge curve. One full cycle lets it remap against the new cell before high-current charging begins.

Sudden shutdown at 20–30% on the Tornado 2 after a cell swap

A new Li-Polymer cell has a slightly different voltage-versus-capacity curve than the degraded cell it replaced. The Tornado 2's fuel gauge IC still references the old curve, so it misreads the new cell's actual state of charge. When the modem fires up during a call or the screen backlight peaks, current draw spikes and the cell voltage drops briefly below the BMS cutoff threshold — even though the gauge still shows 25%. The phone shuts down to protect the cell. One full discharge-charge cycle forces the coulomb counter to resync to the new cell's real discharge curve and eliminates most false cutoffs.

Phone feels warm near the battery during the first few charges

A new cell starts with higher internal impedance than a broken-in one. The charge IC pushes current into higher resistance, and that energy converts to heat before the cell's impedance drops over the first few cycles. On the Tornado 2 this is normal for cycles one through three. Keep the phone out of a case during those first charges so heat can dissipate — if the rear stays below uncomfortable-to-touch, the charge IC is managing it correctly. By cycle four, impedance drops and warmth during charging should be minimal.