TS-BTR006 Toshiba G450 Replacement Battery 3.7V 500mAh

Toshiba G450 — 3.7V Li-ion Replacement Battery (TS-BTR006)

This is a 3.7V, 500mAh Li-ion replacement battery for the Toshiba G450 mobile phone. It replaces OEM part number TS-BTR006. The cell measures 40.60 × 25.22 × 6.72mm and slots into the original battery bay without modification.

• G450 platform fit: The G450 runs a single-cell Li-ion pack at 3.7V nominal. This replacement matches that voltage rail and connector pinout. The BMS communicates charge state to the phone's fuel gauge IC over the same two-wire interface as the original.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the G450 platform. The BMS accepted charge from the device's internal charge IC without fault flags, and the cell held voltage through draw cycles without tripping the low-voltage cutoff prematurely.
• Fuel gauge recalibration on first use: After fitting this cell, disable fast charging if available and run one full discharge-to-charge cycle before normal use. The G450's fuel gauge IC is calibrated to the old cell's discharge curve — one full cycle lets it map the new cell's actual capacity before the percentage readout becomes trustworthy.

Sudden shutdown at 20–30% on the G450 after cell replacement

This is a voltage cliff symptom, not a capacity problem. When the G450's modem transmits or the screen peaks brightness, current draw spikes sharply. A new cell with an uncalibrated fuel gauge IC can misread remaining charge, and the phone shuts down before the percentage reaches zero. The BMS has already hit its low-voltage cutoff — typically around 3.0V — while the OS still reported capacity remaining. One full discharge-recharge cycle after installation lets the coulomb counter anchor to the actual cell curve and moves the cutoff trigger to the correct state-of-charge point.

G450 showing incorrect battery percentage after replacement

The phone's fuel gauge IC stores a learned discharge profile from the previous cell. When a new cell goes in, that stored curve no longer matches the actual cell chemistry or internal resistance. The result is percentage readings that jump erratically or plateau at values like 80% before dropping fast. To fix this, let the phone discharge fully until it powers off, then charge uninterrupted to 100% without interruption. After that single cycle, the fuel gauge IC recalibrates its coulomb counter against the new cell and percentage tracking stabilises.