EB484659VA BoostMobile Transform Ultra Replacement Battery 3.7V 1500mAh

BoostMobile Transform Ultra / SPH-M930 — 3.7V Li-ion Replacement Battery (EB484659VA)

This is a 3.7V, 1500mAh Li-ion battery for the Samsung Transform Ultra (SPH-M930), sold through Boost Mobile. It replaces OEM part numbers EB484659VA and EB484659VU. Swap it in when the original cell no longer holds a usable charge through a normal day of calls, messaging, and app use.

• Transform Ultra / SPH-M930 fit: Both model designations share the same battery bay dimensions, connector pinout, and BMS handshake — the SPH-M930 is the hardware model number behind the Boost-branded Transform Ultra retail name. One battery covers both.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the SPH-M930 platform. The BMS accepted the charge handshake without fault codes, and the protection circuit triggered correctly at low-voltage cutoff — no unexpected trips during normal load cycles.
• Fuel gauge recalibration on first use: After fitting this battery, disable any fast-charge accessories and run one full discharge-to-charge cycle at standard current. The fuel gauge IC on the Transform Ultra calibrates against the cell's discharge curve — skipping this step can leave the coulomb counter mismatched to the new cell from the first charge onward.

Sudden shutdown at 20–30% on the Transform Ultra after a cell swap

This happens because the fuel gauge IC is still reading the old cell's discharge curve. When the modem fires up for a call or the screen brightness spikes, the new cell's voltage drops faster than the IC expects — the phone sees what looks like a valid charge level right up until the voltage collapses under load. The BMS interprets that drop as a protection event and cuts power. Running one full discharge cycle down to automatic shutdown, then charging uninterrupted to 100%, forces the coulomb counter to remap to the new cell's actual voltage curve. After that cycle, the reported percentage tracks the real state of charge correctly.

Phone warm near the battery compartment on the first few charges

A new Li-ion cell has higher internal impedance than a broken-in cell. In the first two or three charge cycles, the charge IC pushes current into a cell that hasn't yet settled its internal resistance — that extra impedance converts some charge energy to heat. This is normal and resolves as the cell cycles. If the phone stays warm past the third full charge cycle, check that the back cover is seated flush — a gap traps heat against the battery. Internal temperature during normal break-in should not exceed what feels uncomfortable to hold; if it does, stop charging and check the charge current setting on any third-party adapter.