About this replacement
Samsung GT-I8700 Omnia 7 — 3.7V Li-ion Replacement Battery (EB504465VU)
This is a 3.7V, 2400mAh Li-ion battery for the Samsung GT-I8700 and Omnia 7 smartphones. It replaces OEM part numbers EB504465VU, EB504465VJ, and EB504465VUBSTD. Swap it in when the original cell no longer holds a charge or the phone shuts down unexpectedly under load.
- GT-I8700 and Omnia 7 fitment: Both handsets share the same battery bay dimensions, connector pinout, and 3.7V nominal voltage rail. One cell fits both because the BMS communication protocol and physical form factor — 64.34 × 43.78 × 10.15mm — are identical across the two models.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the GT-I8700 platform. The BMS accepted the cell without error flags, charge termination triggered correctly at full voltage, and the protection circuit responded to overcurrent as expected.
- Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging and run one full discharge-to-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging is applied to an uncalibrated cell — otherwise percentage readings will drift.
Why the GT-I8700 reports wrong battery percentage after a cell swap
The Omnia 7's fuel gauge IC stores a learned discharge curve from the old cell. When a new cell goes in, that stored model no longer matches the actual cell chemistry. The IC reads voltage and estimates charge state against the wrong curve, so displayed percentage is inaccurate — sometimes by 10–20 points. One full discharge down to auto-shutoff, followed by an uninterrupted charge to 100%, forces the coulomb counter to reset and relearn against the new cell. After that cycle, percentage accuracy returns to normal.
Sudden shutdown at 20–30% on the replacement cell
This happens when the cell voltage drops sharply under the combined load of the modem radio, screen, and processor — a voltage cliff the fuel gauge IC didn't predict. The phone reads 25% available but the cell voltage collapses below the BMS cutoff threshold the moment current draw spikes. It isn't a faulty cell — it's an uncalibrated fuel gauge overestimating remaining charge at mid-range. Run the recalibration cycle described above; after one full discharge-charge pass the IC tracks the cliff correctly and shuts down closer to 5–8%.