About this replacement
Samsung SGH-G810 / SGH-D780 / GT-i8510 — 3.7V Li-ion Replacement Battery (AB474350BE)
This is a 3.7V, 1000mAh Li-ion battery for the Samsung SGH-G810, SGH-D780, SGH-i550, and GT-i8510, among others. It replaces OEM part AB474350BE and its variants. Fit the same footprint: 52.80 × 42.80 × 5.00mm, same connector, same BMS handshake.
- Multi-model fit — SGH and GT series: These handsets share the same battery bay dimensions, 3.7V voltage rail, and OEM connector pinout. The BMS communicates charge state the same way across the SGH-D780, SGH-i550, and GT-i8510, so one cell revision covers all.
- Bench tested on actual hardware: We cycled this cell through full charge and discharge on the SGH-G810. The BMS tripped correctly at low-voltage cutoff, and charge termination fired at the right point without overrun.
- Fuel gauge recalibration on first install: On first use, run one complete discharge-to-charge cycle with fast charging disabled. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes into an uncalibrated state.
Sudden shutdown at 20–30% on the SGH-G810
This happens when the cell voltage drops below what the modem or display load can sustain, even though the reported percentage looks safe. The fuel gauge IC is still calibrated to the old, degraded cell curve — it reads voltage incorrectly against the new cell. The phone's CPU sees a voltage cliff and shuts down to protect the board. One full discharge cycle resets the coulomb counter and stops the premature cutoff.
Percentage jumping erratically after swapping the cell
After installing a new cell, the SGH-G810's fuel gauge IC has no reference data for the replacement's actual capacity and internal resistance. It interpolates charge state from incomplete data, which produces jumps of 10–15% in either direction. This is not a faulty battery — it is the IC recalibrating. Run two full discharge-charge cycles without interruption and the percentage readout will stabilise.