EB485159LA Virgin Mobile SPH-M950 Replacement Battery 3.7V 3600mAh

Virgin Mobile SPH-M950 / Galaxy Reverb — 3.7V Li-ion Replacement Battery (EB485159LA)

This 3.7V Li-ion cell replaces the original EB485159LA battery in the Virgin Mobile SPH-M950 and Galaxy Reverb smartphone. Capacity is 3600mAh (13.32Wh) — a step up from the stock cell. The physical footprint matches at 59.00 × 50.78 × 9.70mm, so it fits the battery bay without modification.

• SPH-M950 and Galaxy Reverb fit: Both models share the same battery bay dimensions, connector pinout, and BMS handshake protocol. One cell covers the full SPH-M950DAAVMU variant as well.
• Bench tested on actual hardware: We ran charge and discharge cycles on the SPH-M950 platform and confirmed the BMS accepted the cell without throwing an authentication error or triggering a false low-battery cutoff.
• Fuel gauge recalibration after swap: On first use after installation, disable fast charging and run one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before the charge IC pushes higher current into an uncalibrated cell.

Sudden shutdown at 20–30% on the SPH-M950 after a cell swap

The SPH-M950's fuel gauge IC stores a discharge curve from the previous cell. When a new cell with a different internal impedance goes in, the IC's voltage model no longer matches actual cell behaviour. Under peak load — screen on full brightness, mobile data active — the cell voltage drops faster than the IC predicts, and the phone interprets this as a critical voltage event and cuts off. One full discharge-to-shutdown followed by a full charge resets the coulomb counter and trains the IC against the new cell curve. After that cycle, shutdowns at 20–30% reported charge typically stop.

Device won't power on after the replacement cell sat in storage

Li-ion cells shipped or stored for several months can drop below 3.0V. The EB485159LA's BMS has a hard lockout below approximately 2.5V per cell — it blocks charging to prevent a damaged cell from accepting current. Plugging in a charger at this point shows nothing on screen. Connect the phone to a 5V USB charger and leave it untouched for 20–30 minutes — some chargers trickle a small pre-charge current that nudges the cell above the BMS threshold. Once voltage climbs above 2.5V, the BMS re-enables normal charging and the phone will power on.