Samsung Galaxy S4 Mini B500AU Replacement Battery 3.7V 1400mAh

Samsung Galaxy S4 Mini — 3.7V Li-ion Replacement Battery (EB-B500BE)

This is a 3.7V, 1400mAh Li-ion cell that replaces the original battery in the Samsung Galaxy S4 Mini (GT-I9190, GT-I9195, SGH-I257) and S4 Mini LTE variants. It fits the standard battery bay without modification and connects via the original three-contact terminal strip. OEM part numbers covered include B500AU, B500BU, EB-B500BU, and EB-B500BE.

• S4 Mini platform fit: All S4 Mini variants share the same battery bay dimensions and terminal pinout — 69.10 x 50.90 x 4.20mm with a three-pin contact layout. The voltage rail and BMS handshake are identical across GT-I9190, GT-I9195, and SGH-I257, so one cell covers the full range.
• Bench tested on actual hardware: We ran this cell in a GT-I9190 unit and confirmed BMS handshake on first insertion. The charge IC accepted the cell immediately and the protection circuit tripped correctly at both high-voltage and low-voltage thresholds during discharge cycling.
• Fuel gauge recalibration on first install: After fitting this cell, run one full discharge to system shutdown followed by a complete uninterrupted charge to 100% before enabling fast charging. This gives the Galaxy S4 Mini's fuel gauge IC time to map the new cell's discharge curve before high-current charging begins.

Why the S4 Mini reports wrong battery percentage after a cell swap

The Galaxy S4 Mini uses a coulomb counter in its fuel gauge IC that builds a capacity model from charge and discharge history. When you install a new cell, that model still references the old cell's degraded curve, so the percentage reading is immediately out of sync. The IC needs at least one full discharge-to-shutdown and charge-to-100% cycle to reset its reference points against the new cell. Until that cycle completes, the reported percentage can run high or low by 10–20%, and the low-battery warning may fire at the wrong point.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops below the load threshold under peak demand — typically during LTE data bursts or screen-on transitions — even though the fuel gauge still shows charge remaining. On a new, uncalibrated cell the voltage cliff appears earlier in the discharge curve than the IC expects. The fix is to complete two full discharge-charge cycles so the coulomb counter recalibrates its end-of-discharge voltage reference. After calibration, the shutdown point should stabilise above 3.4V per cell under normal load.