Samsung Galaxy Grand EB535163LU Replacement Battery 3.8V 2100mAh

Samsung Galaxy Grand GT-i9080 / GT-i9082 — 3.8V Li-ion Replacement Battery (EB535163LU)

This is a 3.8V, 2100mAh Li-ion replacement cell for the Samsung Galaxy Grand and Galaxy Grand Duos. It fits GT-i9080, GT-i9082, and 13 additional Samsung models sharing the EB535163LU / EB535163LA part number. Swap it when your original cell no longer holds a usable charge through a normal day of use.

• GT-i9080 and GT-i9082 compatibility: Both the single-SIM Grand and the Duos dual-SIM variant use the same physical cell format, connector pinout, and BMS handshake protocol — one cell covers both boards. The EB535163LA designation is a regional variant of the same unit.
• Bench tested on actual hardware: We ran this cell on a GT-i9082 board and confirmed the BMS completed a full charge cycle without triggering an over-voltage cutoff. The charge IC accepted the cell on first insertion without a reset sequence.
• Fuel gauge recalibration on first cycle: After fitting this cell, run one complete discharge down to auto-shutoff before charging back to 100%. The Galaxy Grand's fuel gauge IC calibrates its coulomb counter against the discharge curve of the installed cell — skipping this step causes the percentage indicator to drift or jump erratically in early use.

Sudden shutdown at 20–30% on the Galaxy Grand after a cell swap

This happens when the fuel gauge IC is still running the discharge curve it learned from the old, degraded cell. The new cell has a steeper voltage cliff under modem and display load than the IC expects at that state-of-charge reading. When the actual cell voltage drops below the board's cutoff threshold, the phone shuts off — even though the percentage display still shows charge remaining. One full discharge-to-shutoff cycle lets the coulomb counter remap against the new cell's actual curve. After that cycle, shutdowns at false-high percentages stop.

Galaxy Grand shows wrong battery percentage after replacement

The fuel gauge IC on the GT-i9080 stores learned capacity data from the previous cell in non-volatile memory. After installing a new cell, that stored data no longer matches the actual cell characteristics, so the percentage readout is unreliable — often reading high and then dropping suddenly. Drain the phone completely until it powers off on its own, then charge uninterrupted to 100% without unplugging early. That single full cycle forces the IC to rewrite its reference curve against the new cell. Percentage accuracy stabilises within one or two cycles after that.