T-Mobile EB484659VA Replacement Battery 3.7V 1500mAh

T-Mobile EB484659VA — 3.7V Li-ion Replacement Battery

This is a 3.7V, 1500mAh Li-ion replacement battery for T-Mobile smartphones using OEM part numbers EB484659VA, EB484659VU, EB484659VABSTD, and EB484659VUBSTD. It restores power to devices where the original cell has degraded or lost the ability to hold a charge. Drop it in when the original battery no longer gets the phone through a normal day.

• OEM part number cross-reference: The four OEM part numbers — EB484659VA, EB484659VU, and their BSTD-suffix variants — share the same 3.7V cell platform, connector footprint, and BMS handshake, making them interchangeable on compatible T-Mobile handsets.
• Bench tested on actual hardware: We cycled this cell through charge and discharge under load, confirmed the BMS communicates correctly with the charge IC, and verified the protection circuit trips cleanly at the expected cutoff voltage without false shutdowns.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging introduces error into an uncalibrated baseline.

Sudden shutdown at 20–30% on a replacement cell

A new Li-ion cell has a slightly different voltage curve than the aged cell the fuel gauge IC was calibrated against. When the phone's modem or display draws a high burst of current, the cell voltage dips sharply — even if the reported percentage looks safe. The OS reads that dip as a critical low-voltage event and cuts power instantly. One full discharge-charge cycle on standard charging rewrites the coulomb counter baseline and stops this behaviour in most cases.

OS reporting wrong battery percentage after a cell swap

The fuel gauge IC stores a learned discharge curve from the old cell. After a swap, that stored curve no longer matches the new cell's actual voltage-versus-capacity profile. The result is percentage readings that jump, stall, or land well above or below reality. Drain the battery until the phone powers off on its own, then charge uninterrupted to 100% — the IC resets its reference points and percentage reporting stabilises within one to two cycles.