Samsung Galaxy Beam GT-i8580 Replacement Battery 3.8V 2000mAh

Samsung Galaxy Core Advance / GT-i8580 — 3.8V Li-ion Replacement Battery (B210BE)

This 3.8V, 2000mAh Li-ion cell replaces the original B210BE, B210BC, and B210BU batteries across the Samsung GT-i8580 (Galaxy Beam2), Galaxy Core Advance, SHW-M570, and SHW-M570S. All four models share the same connector footprint, BMS handshake protocol, and 3.8V nominal voltage rail. Dimensions are 56.28 × 51.13 × 6.02 mm — confirm the fit against the original before installation.

• GT-i8580 and Core Advance platform compatibility: These models share a common power management IC and BMS communication protocol. The same cell chemistry, connector, and voltage floor apply across all listed variants, so one replacement SKU covers the group without modification.
• Bench tested on actual hardware: We cycled this cell through charge, standby, and screen-on load states. The BMS held stable at rated voltage and tripped correctly at the low-voltage cutoff — no premature shutoffs were recorded during discharge under normal screen and modem load.
• Fuel gauge recalibration on first use: On the GT-i8580, disable any fast charge mode for the first full discharge-charge cycle after fitting this cell. The fuel gauge IC ships calibrated to the old cell's discharge curve. One full cycle at standard current lets it recalibrate before high-current charging pushes into an uncalibrated state.

Sudden shutdown at 20–30% on the GT-i8580 after a cell swap

The GT-i8580's power management IC reads cell voltage to estimate remaining capacity. A new cell has a slightly different discharge curve than the degraded original — the voltage drops faster in the lower charge band than the fuel gauge expects. Under modem or display load, voltage sags below the cutoff threshold while the gauge still reads 20–30%. The fix is one complete discharge to automatic power-off, followed by a full charge at standard current, which resets the coulomb counter against the new cell's actual curve.

Phone not powering on after the replacement cell sat in storage

Li-ion cells self-discharge during storage. If this battery arrived below 2.5V per cell, the BMS may have entered lockout mode to prevent damage — the phone will show no response to the power button or charger. Connect the phone to a wall charger (not a USB port) for at least 15–20 minutes without pressing anything. The charge IC will trickle-charge the cell back above the BMS re-initialisation threshold, typically around 2.9–3.0V, after which normal charging resumes.