T-Mobile Move Compatible Battery 3.7V 1300mAh CAB31P0000C1

T-Mobile Move — 3.7V Li-ion Replacement Battery (CAB31P0000C1)

This is a 3.7V, 1300mAh Li-ion replacement battery for the T-Mobile Move smartphone. It fits the Move directly, matching the original cell's voltage, physical dimensions (64.30 × 49.50 × 4.50mm), and connector. Capacity is rated at 4.81Wh — identical to the OEM specification.

• T-Mobile Move compatibility: The Move uses a fixed 3.7V single-cell Li-ion architecture with a dedicated connector keyed to this footprint. OEM part numbers CAB31P0000C1, CAB31P0001C1, and TB-4T0058200 all reference the same cell specification for this platform.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Move. The BMS accepted the cell without fault flags, charge termination triggered correctly at 4.2V, and the protection circuit responded to overcurrent conditions as expected.
• Fuel gauge recalibration on first use: After installation, disable fast charging and run one full discharge-to-charge cycle before resuming normal use. This lets the Move's fuel gauge IC map the new cell's discharge curve before the charge controller pushes high-current charge into an uncalibrated cell — preventing erratic percentage readings from the start.

Why the Move reports wrong battery percentage after a cell swap

The Move uses a fuel gauge IC that builds a model of the cell based on charge and discharge history. When you install a new cell, that model is still calibrated to the old cell's impedance and capacity curve. Until the IC runs at least one full cycle on the new cell, the percentage shown on screen is essentially a guess. A single complete discharge and recharge cycle — without fast charging — gives the coulomb counter enough data to re-anchor its state-of-charge estimate accurately.

Sudden shutdown at 20–30% remaining on the replacement cell

This happens when the fuel gauge IC still holds the old cell's voltage curve in memory and miscalculates how much charge is left. Under load — screen on, mobile data active — the cell voltage drops faster than the gauge predicts, and the phone shuts off before the displayed percentage reaches zero. The fix is the same recalibration cycle: drain the battery until the phone powers off on its own, then charge uninterrupted to 100%. After that cycle, the gauge IC resets its low-voltage cutoff reference to match the new cell. If shutdowns continue past two cycles, check that the cutoff voltage during discharge is not dropping below 3.0V.