Samsung Galaxy Beam EB585157LU Replacement Battery 3.7V 1600mAh

Samsung Galaxy Beam GT-I8530 / GT-I8550 — 3.7V Li-ion Replacement Battery (EB585157LU)

The EB585157LU is a 3.7V, 1600mAh Li-ion battery for the Samsung Galaxy Beam smartphone. It fits the GT-I8530, GT-I8550, GT-I8558, and related variants in the Galaxy Beam line. This cell replaces a degraded or failed original when the phone no longer holds a full charge or stops powering on.

• Galaxy Beam GT-I8530 / GT-I8550 / GT-I8558 compatibility: These models share the same battery bay dimensions, 3.7V nominal rail, and connector footprint. The EB585157LU part number covers all variants in this family without modification.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on GT-I8530 hardware. The BMS accepted charge immediately, voltage held stable under combined projector and screen load, and the protection circuit tripped correctly at low-voltage cutoff.
• Fuel gauge recalibration on first use: After fitting this cell, disable fast charging and run one complete discharge-to-charge cycle before relying on the battery percentage indicator. The Galaxy Beam's fuel gauge IC is calibrated to the old cell's discharge curve — one full cycle resets it against the new cell's actual capacity.

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

This happens because the fuel gauge IC still holds the discharge curve of the original cell. When the new cell's voltage drops below the point the gauge expects, the phone reads it as critically low and cuts power — even if usable charge remains. The projector draws a surge of current that accelerates this voltage cliff. Run one full discharge cycle without the projector active, then charge to 100% uninterrupted. After that cycle, the fuel gauge recalibrates and shutdowns at false low percentages stop.

Phone feels warm near the battery during the first few charges

A new Li-ion cell has higher internal impedance than a broken-in cell, so the charge IC works harder to push current in during the first few cycles. This generates mild heat near the battery compartment — it is normal and settles within two to three full charge cycles. If the phone is hot to the touch or charge stops before 100% repeatedly, check that the charge port is clean and the cable is not limiting current. Warmth that persists past the third cycle points to a charge IC issue on the board, not the cell.